Overall Green Tropical Cyclone alert for HERMAN-23 Off-shore from 29 Mar 2023 06:00 UTC to 02 Apr 2023 06:00 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Green alert Tropical Cyclone for HERMAN-23

Off-shore

Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone HERMAN-23 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GFS
Exposed countries
Exposed population	No people in Category 1 or higher
Maximum wind speed	166 km/h
Maximum storm surge	0.5 m (31 Mar 08:30 UTC)
Vulnerability	--

GDACS Score

GDACS alert score for Tropical Cyclones is 0.5 (GREEN Alert), 1.5 (ORANGE Alert), 2.5 (RED Alert)
For more info on GDACS alert score click here.

	Wind	Storm surge	Rainfall	GDACS score
GFS Current	166 km/h	0.5 m	241 mm	0.5
GFS Overall	191 km/h	0.7 m	568 mm	0.5
Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track)

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Wind

Wind exposed population - AoIs

No exposed population (in Tropical Storm or higher) based on the bulletin of 31 Mar 2023 06:00 UTC

See TC classification SSHS

Wind Impact Timeline

people affected <=10000

10000< people affected <=100000

people affected >100000

N°	Date (UTC)	Max Winds (km/h)	Pop in Cat. 1 or higher	TS	Cat. 1	Cat. 2	Cat. 3	Cat. 4	Cat. 5
1	29 Mar 2023 06:00	86	-	-	-	-	-	-	-
2	29 Mar 2023 12:00	97	-	-	-	-	-	-	-
3	29 Mar 2023 18:00	83	-	-	-	-	-	-	-
4	30 Mar 2023 00:00	101	-	-	-	-	-	-	-
5	30 Mar 2023 06:00	108	-	-	-	-	-	-	-
6	30 Mar 2023 12:00	137	-	-	-	-	-	-	-
7	30 Mar 2023 18:00	137	-	-	-	-	-	-	-
8	31 Mar 2023 00:00	155	-	-	-	-	-	-	-
9	31 Mar 2023 06:00	166	-	-	-	-	-	-	-

Download:

Impact estimation for the next 72h

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Rainfall

568 mm

Up to 1.4 million can be affected by rain higher than 100mm (see SSHS)

Rain exposed population - AoIs

Estimations based on the bulletin of 31 Mar 2023 06:00 UTC

Level	Country	Population
100-250 mm	Indonesia	1,357,987
50-100 mm	Indonesia	27,924,672

Rain Impact Timeline

people affected <=10000

10000< people affected <=100000

people affected >100000

N°	Date (UTC)	Max Rainfall (mm)	Pop >100mm or higher	50-100	100-250	250-500	500-750	750-1000	>1000	Countries
1	29 Mar 2023 06:00	86	-		-	-	-	-	-	Australia
2	29 Mar 2023 12:00	121	-		-	-	-	-	-	Indonesia
3	29 Mar 2023 18:00	118	-	-	-	-	-	-	-
4	30 Mar 2023 00:00	96	-	-	-	-	-	-	-
5	30 Mar 2023 06:00	168	-		-	-	-	-	-	Indonesia
6	30 Mar 2023 12:00	236	-		-	-	-	-	-	Indonesia
7	30 Mar 2023 18:00	138	-	-	-	-	-	-	-
8	31 Mar 2023 00:00	219	-	-	-	-	-	-	-
9	31 Mar 2023 06:00	363	1.4 million			-	-	-	-	Indonesia

Impact estimation for the next 72h

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StormSurge

0.5 m

The maximum Storm surge height is 0.5m in Pardoo, Australia. This height is estimated for 31 Mar 2023 08:30 UTC .

The JRC has developed an experimental global storm surge model, which is run after each advisory issued by the regional tropical cyclone centres. The calculations are published about 20 minutes after a new advisory is detected by GDACS. The calculations identify the populated places affected by storm surge up to three days in advance, using the forecasted track. When forecasts change, the associated storm surge changes too and alert levels may go up or down. All links, data, statistics and maps refer to the latest available calculation. If the calculation for the last advisory is not completed, the latest available calculation is shown.

Storm Surge Exposed population - AoIs

Storm Surge Exposed locations

Calculation based on the bulletin of 31 Mar 2023 06:00 UTC

Alert	Date (UTC)	Name	Country	Storm surge height (m)
	31 Mar 2023 08:30	Pardoo	Australia	0.5
	31 Mar 2023 08:30	Condon	Australia	0.5
	31 Mar 2023 06:45	Menango	Indonesia	0.4
	31 Mar 2023 06:45	Tandjungkarang	Indonesia	0.4
	31 Mar 2023 06:45	Telukbetung	Indonesia	0.4
	31 Mar 2023 06:45	Tarahan	Indonesia	0.4
	31 Mar 2023 06:45	Kekatang	Indonesia	0.4
	31 Mar 2023 06:45	Kiluan	Indonesia	0.4
	31 Mar 2023 09:15	Horrocks	Australia	0.4
	31 Mar 2023 09:15	Gregory	Australia	0.3
	31 Mar 2023 09:15	Lynton	Australia	0.3
	31 Mar 2023 09:15	Drummond Cove	Australia	0.3
	31 Mar 2023 09:15	Popes Landing	Australia	0.3
	31 Mar 2023 11:00	Port Hedland	Australia	0.3
	31 Mar 2023 11:00	Wedgefield	Australia	0.3
	31 Mar 2023 09:15	Waggrakine	Australia	0.3
	31 Mar 2023 09:15	Geraldton	Australia	0.3
	31 Mar 2023 06:30	Umbulan Pepanggar	Indonesia	0.3
	31 Mar 2023 09:15	Kalbarri	Australia	0.3
	31 Mar 2023 07:00	Kualalupak	Indonesia	0.2
	31 Mar 2023 09:00	Kandangan	Indonesia	0.2
	31 Mar 2023 09:00	Gresik	Indonesia	0.2
	31 Mar 2023 09:00	Pangkalan	Indonesia	0.2
	31 Mar 2023 09:00	Batoe Porong	Indonesia	0.2
	31 Mar 2023 09:00	Kebanjar	Indonesia	0.2
	31 Mar 2023 06:45	Bapuju	Indonesia	0.2
	31 Mar 2023 06:45	Bahaur	Indonesia	0.2
	31 Mar 2023 09:15	Greenough	Australia	0.2
	31 Mar 2023 06:30	Aluhaluh	Indonesia	0.2
	31 Mar 2023 06:30	Tambakkarangan	Indonesia	0.2
	31 Mar 2023 06:30	Bawahalajung	Indonesia	0.2
	31 Mar 2023 07:15	Wickham	Australia	0.2
	31 Mar 2023 07:15	Point Samson	Australia	0.2
	31 Mar 2023 07:15	Cossack	Australia	0.2
	31 Mar 2023 08:30	Baliga	Indonesia	0.2
	31 Mar 2023 08:30	Laboean	Indonesia	0.2
	31 Mar 2023 06:00	Tabanio	Indonesia	0.2
	31 Mar 2023 08:45	Denison	Australia	0.2
	31 Mar 2023 08:45	Port Denison	Australia	0.2
	31 Mar 2023 08:45	Dongara	Australia	0.2
	31 Mar 2023 06:00	Pagatan	Indonesia	0.2
	31 Mar 2023 06:00	Pagetan	Indonesia	0.2
	31 Mar 2023 11:30	Loeri	Indonesia	0.2
	31 Mar 2023 06:00	Setiroek	Indonesia	0.2
	31 Mar 2023 07:00	Onslow	Australia	0.2
	31 Mar 2023 06:45	Kalianda	Indonesia	0.2
	31 Mar 2023 09:15	Kencong	Indonesia	0.2
	31 Mar 2023 09:15	Lodjedjer	Indonesia	0.2
	31 Mar 2023 08:00	Sumberkuning	Indonesia	0.2
	31 Mar 2023 07:30	Pasuruan	Indonesia	0.2
	31 Mar 2023 06:00	East Lewis I	Australia	0.2
	31 Mar 2023 06:00	Dampier	Australia	0.2
	31 Mar 2023 07:30	Bayeman	Indonesia	0.2
	31 Mar 2023 07:45	Sampang	Indonesia	0.2
	31 Mar 2023 06:00	Batakam	Indonesia	0.2
	31 Mar 2023 06:00	Kandangan	Indonesia	0.2
	31 Mar 2023 08:30	Illawong	Australia	0.2
	31 Mar 2023 09:45	Sembelimbingan	Indonesia	0.2
	31 Mar 2023 09:45	Berangas	Indonesia	0.2
	31 Mar 2023 09:45	Soengaibali	Indonesia	0.2
	31 Mar 2023 10:00	Langadai	Indonesia	0.2
	31 Mar 2023 10:00	Senaking	Indonesia	0.2
	31 Mar 2023 06:30	Guring	Indonesia	0.2
	31 Mar 2023 06:30	Kota Agung	Indonesia	0.2
	31 Mar 2023 12:00	Karratha	Australia	0.2
	31 Mar 2023 10:00	Busselton	Australia	0.2
	31 Mar 2023 10:00	Wonnerup	Australia	0.2
	31 Mar 2023 10:00	Ludlow	Australia	0.2
	31 Mar 2023 10:00	Dalyellup	Australia	0.2
	31 Mar 2023 10:00	Sungaianjar	Indonesia	0.2
	31 Mar 2023 07:45	Probolinggo	Indonesia	0.2
	31 Mar 2023 09:15	Hamelin Pool	Australia	0.2
	31 Mar 2023 09:15	Hamelin	Australia	0.2
	31 Mar 2023 08:00	Tapil	Indonesia	0.2
	31 Mar 2023 07:30	Gending	Indonesia	0.2
	31 Mar 2023 07:00	Kraksaan	Indonesia	0.2
	31 Mar 2023 07:00	Karagajar	Indonesia	0.2
	31 Mar 2023 09:45	Bunbury	Australia	0.2
	31 Mar 2023 09:45	Picton	Australia	0.2
	31 Mar 2023 09:45	Eaton	Australia	0.2
	31 Mar 2023 09:00	Pagatan	Indonesia	0.2
	31 Mar 2023 09:00	Semisir	Indonesia	0.2
	31 Mar 2023 09:00	Salinau	Indonesia	0.2
	31 Mar 2023 09:00	Semaras	Indonesia	0.2
	31 Mar 2023 09:45	Broadwater	Australia	0.2
	31 Mar 2023 11:15	Tjikawung	Indonesia	0.2
	31 Mar 2023 11:15	Aerdjeruk	Indonesia	0.2
	31 Mar 2023 06:00	Mardie	Australia	0.2
	31 Mar 2023 07:15	Galis	Indonesia	0.2
	31 Mar 2023 09:15	Komodo	Indonesia	0.1
	31 Mar 2023 08:15	Boenati	Indonesia	0.1
	31 Mar 2023 07:30	Prenduan	Indonesia	0.1
	31 Mar 2023 10:00	Burragenup	Australia	0.1
	31 Mar 2023 10:00	Australind	Australia	0.1
	31 Mar 2023 07:00	Sumur	Indonesia	0.1
	31 Mar 2023 07:00	Babakancibeber	Indonesia	0.1
	31 Mar 2023 07:00	Tjiteureup	Indonesia	0.1
	31 Mar 2023 07:15	Djate	Indonesia	0.1
	31 Mar 2023 07:15	Bluto	Indonesia	0.1
	31 Mar 2023 08:30	Tapianbalai	Indonesia	0.1
	31 Mar 2023 09:00	Coolimba	Australia	0.1
	31 Mar 2023 07:15	Besuki	Indonesia	0.1
	31 Mar 2023 07:00	Saroka	Indonesia	0.1
	31 Mar 2023 07:00	Sumenep	Indonesia	0.1
	31 Mar 2023 07:00	Bundan	Indonesia	0.1
	31 Mar 2023 11:30	Dirk Hartog	Australia	0.1
	31 Mar 2023 11:30	Useless Loop	Australia	0.1
	31 Mar 2023 06:45	Bandjaragung	Indonesia	0.1
	31 Mar 2023 09:45	Binningup	Australia	0.1
	31 Mar 2023 09:45	Myalup	Australia	0.1
	31 Mar 2023 07:00	Mandingan	Indonesia	0.1
	31 Mar 2023 08:30	Lenteng	Indonesia	0.1
	31 Mar 2023 08:30	Rinca	Indonesia	0.1
	31 Mar 2023 08:30	Lo'o	Indonesia	0.1
	31 Mar 2023 06:00	Ah Chong I	Australia	0.1
	31 Mar 2023 07:15	Gedugan	Indonesia	0.1
	31 Mar 2023 07:15	Djangdjangan	Indonesia	0.1
	31 Mar 2023 06:45	Karangberak	Indonesia	0.1
	31 Mar 2023 09:45	Quindalup	Australia	0.1
	31 Mar 2023 07:45	Pakue	Indonesia	0.1
	31 Mar 2023 07:45	Lelewao	Indonesia	0.1
	31 Mar 2023 07:45	Tolala	Indonesia	0.1
	31 Mar 2023 08:15	Sape	Indonesia	0.1
	31 Mar 2023 08:15	Toronaroe	Indonesia	0.1
	31 Mar 2023 08:15	Badjo	Indonesia	0.1
	31 Mar 2023 09:15	Brassan	Indonesia	0.1
	31 Mar 2023 09:15	Muntjar	Indonesia	0.1
	31 Mar 2023 09:15	Blimbing	Indonesia	0.1
	31 Mar 2023 09:15	Dadapan	Indonesia	0.1
	31 Mar 2023 09:15	Banyuwangi	Indonesia	0.1
	31 Mar 2023 09:15	Banjuwangi	Indonesia	0.1
	31 Mar 2023 09:15	Gilimanuk	Indonesia	0.1
	31 Mar 2023 09:15	Penginoeman	Indonesia	0.1
	31 Mar 2023 09:15	Belimbingsari	Indonesia	0.1
	31 Mar 2023 09:15	Tjandikesuma	Indonesia	0.1
	31 Mar 2023 09:15	Banjoebiroe	Indonesia	0.1
	31 Mar 2023 07:00	Kolitjaah	Indonesia	0.1
	31 Mar 2023 07:15	Labuhan	Indonesia	0.1
	31 Mar 2023 07:15	Kaduperasi	Indonesia	0.1
	31 Mar 2023 07:30	Libureng	Indonesia	0.1
	31 Mar 2023 07:30	Marek	Indonesia	0.1
	31 Mar 2023 07:15	Wotu	Indonesia	0.1
	31 Mar 2023 07:15	Belantan	Indonesia	0.1
	31 Mar 2023 06:30	Situbondo	Indonesia	0.1
	31 Mar 2023 06:30	Kesambirampak	Indonesia	0.1
	31 Mar 2023 09:30	Lapatawang	Indonesia	0.1
	31 Mar 2023 09:30	Kirihei	Indonesia	0.1
	31 Mar 2023 09:30	Kampoeng Melolo	Indonesia	0.1
	31 Mar 2023 09:30	Melolo	Indonesia	0.1
	31 Mar 2023 09:30	Jawang	Indonesia	0.1
	31 Mar 2023 07:00	Banbalo	Indonesia	0.1
	31 Mar 2023 06:45	Putih	Indonesia	0.1
	31 Mar 2023 08:30	Djagalaja	Indonesia	0.1
	31 Mar 2023 08:30	Leeman	Australia	0.1
	31 Mar 2023 07:15	Capasolo	Indonesia	0.1
	31 Mar 2023 07:15	Pongko	Indonesia	0.1
	31 Mar 2023 09:00	Koeta	Indonesia	0.1
	31 Mar 2023 09:00	Awang	Indonesia	0.1
	31 Mar 2023 09:00	Sunut	Indonesia	0.1
	31 Mar 2023 09:15	Cupel	Indonesia	0.1
	31 Mar 2023 09:15	Prancak	Indonesia	0.1
	31 Mar 2023 09:15	Negara	Indonesia	0.1
	31 Mar 2023 08:30	Waingapu	Indonesia	0.1
	31 Mar 2023 08:30	Matawai	Indonesia	0.1
	31 Mar 2023 08:30	Pajeti	Indonesia	0.1
	31 Mar 2023 08:30	Lakohembi	Indonesia	0.1
	31 Mar 2023 06:00	Sawarangan	Indonesia	0.1
	31 Mar 2023 06:45	Glenroy	Australia	0.1
	31 Mar 2023 09:30	Pringgabaja	Indonesia	0.1
	31 Mar 2023 09:30	Lombok	Indonesia	0.1
	31 Mar 2023 09:30	Sembelie	Indonesia	0.1
	31 Mar 2023 07:30	Amasang	Indonesia	0.1
	31 Mar 2023 11:30	Warroora	Australia	0.1
	31 Mar 2023 07:45	Cervantes	Australia	0.1
	31 Mar 2023 07:30	Surutanga	Indonesia	0.1
	31 Mar 2023 07:30	Bua	Indonesia	0.1
	31 Mar 2023 07:30	Boesak	Indonesia	0.1
	31 Mar 2023 07:30	Lura	Indonesia	0.1
	31 Mar 2023 07:30	Bassiang	Indonesia	0.1
	31 Mar 2023 06:45	Sawangbalak	Indonesia	0.1
	31 Mar 2023 08:00	Green Head	Australia	0.1
	31 Mar 2023 11:00	Laboean Mapin	Indonesia	0.1
	31 Mar 2023 11:00	Alas	Indonesia	0.1
	31 Mar 2023 11:00	Pernang	Indonesia	0.1
	31 Mar 2023 06:00	Sumberwaru	Indonesia	0.1
	31 Mar 2023 06:00	Sunberanjar	Indonesia	0.1
	31 Mar 2023 11:15	Gladstone	Australia	0.1
	31 Mar 2023 06:45	Tampang	Indonesia	0.1
	31 Mar 2023 07:45	Jurien	Australia	0.1
	31 Mar 2023 10:15	Boedae	Indonesia	0.1
	31 Mar 2023 10:15	Kota Boddo	Indonesia	0.1
	31 Mar 2023 10:15	Wawarei	Indonesia	0.1
	31 Mar 2023 10:15	Ege	Indonesia	0.1
	31 Mar 2023 10:15	Seba	Indonesia	0.1
	31 Mar 2023 10:15	Kotahawoe	Indonesia	0.1
	31 Mar 2023 09:45	Bendungan	Indonesia	0.1
	31 Mar 2023 09:45	Galur	Indonesia	0.1
	31 Mar 2023 09:45	Srandakan	Indonesia	0.1
	31 Mar 2023 09:45	Kebonongan	Indonesia	0.1
	31 Mar 2023 09:45	Tirtohardjo	Indonesia	0.1
	31 Mar 2023 08:45	Petjatu	Indonesia	0.1
	31 Mar 2023 08:45	Seseh	Indonesia	0.1
	31 Mar 2023 08:45	Kuta	Indonesia	0.1
	31 Mar 2023 08:45	Djimbaran	Indonesia	0.1
	31 Mar 2023 08:45	Boealoe	Indonesia	0.1
	31 Mar 2023 08:45	Benua	Indonesia	0.1
	31 Mar 2023 08:45	Denpasar	Indonesia	0.1
	31 Mar 2023 08:45	Sukawati	Indonesia	0.1
	31 Mar 2023 07:15	Kolaka	Indonesia	0.1
	31 Mar 2023 07:15	Tambea	Indonesia	0.1
	31 Mar 2023 07:15	Poendoei	Indonesia	0.1
	31 Mar 2023 07:15	Baru	Indonesia	0.1
	31 Mar 2023 08:00	Boku	Indonesia	0.1
	31 Mar 2023 09:00	Merapo	Indonesia	0.1
	31 Mar 2023 09:15	Below	Indonesia	0.1
	31 Mar 2023 09:15	Baah	Indonesia	0.1
	31 Mar 2023 07:45	Chilachap	Indonesia	0.1
	31 Mar 2023 07:45	Adipala	Indonesia	0.1
	31 Mar 2023 11:30	Cardabia	Australia	0.1
	31 Mar 2023 11:15	Denham	Australia	0.1
	31 Mar 2023 07:30	Tangetada	Indonesia	0.1
	31 Mar 2023 08:45	Tamala	Australia	0.1
	31 Mar 2023 07:45	Pakoee	Indonesia	0.1
	31 Mar 2023 07:45	Benteng	Indonesia	0.1
	31 Mar 2023 07:00	Barabbo	Indonesia	0.1
	31 Mar 2023 08:00	Exmouth	Australia	0.1
	31 Mar 2023 07:30	Konaweha	Indonesia	0.1
	31 Mar 2023 09:00	Labih	Indonesia	0.1
	31 Mar 2023 09:00	Bandjarangkan	Indonesia	0.1
	31 Mar 2023 09:00	Lungkung	Indonesia	0.1
	31 Mar 2023 09:00	Lembongan	Indonesia	0.1
	31 Mar 2023 09:00	Tojapakeh	Indonesia	0.1
	31 Mar 2023 09:00	Batoemadeg	Indonesia	0.1
	31 Mar 2023 09:00	Batoemoenggoel	Indonesia	0.1
	31 Mar 2023 09:00	Tanglad	Indonesia	0.1
	31 Mar 2023 08:00	Ajah	Indonesia	0.1
	31 Mar 2023 08:00	Petanahan	Indonesia	0.1
	31 Mar 2023 09:15	Rockingham	Australia	0.1
	31 Mar 2023 09:15	Fremantle	Australia	0.1
	31 Mar 2023 09:15	North Fremantle	Australia	0.1
	31 Mar 2023 09:15	Mosman Park	Australia	0.1
	31 Mar 2023 09:15	Cottesloe	Australia	0.1
	31 Mar 2023 09:15	East Fremantle	Australia	0.1
	31 Mar 2023 09:15	Coogee	Australia	0.1
	31 Mar 2023 09:15	Peppermint Grove	Australia	0.1
	31 Mar 2023 09:15	Swanbourne	Australia	0.1
	31 Mar 2023 09:15	Claremont	Australia	0.1
	31 Mar 2023 09:15	Spearwood	Australia	0.1
	31 Mar 2023 09:15	Bicton	Australia	0.1
	31 Mar 2023 09:15	Wattleup	Australia	0.1
	31 Mar 2023 09:00	Katewela	Indonesia	0.1
	31 Mar 2023 09:00	Karendi	Indonesia	0.1
	31 Mar 2023 07:30	Loholoho	Indonesia	0.1
	31 Mar 2023 07:30	Lanipa	Indonesia	0.1
	31 Mar 2023 07:00	Doping	Indonesia	0.1
	31 Mar 2023 07:00	Djalang	Indonesia	0.1
	31 Mar 2023 07:00	Kotie	Indonesia	0.1
	31 Mar 2023 07:00	Palima	Indonesia	0.1
	31 Mar 2023 11:45	Gnaraloo	Australia	0.1
	31 Mar 2023 08:15	Muarabinuangeun	Indonesia	0.1
	31 Mar 2023 08:15	Plotot	Indonesia	0.1
	31 Mar 2023 06:45	Lamoeroe	Indonesia	0.1
	31 Mar 2023 06:45	Waetuwa	Indonesia	0.1
	31 Mar 2023 07:30	Tiop	Indonesia	0.1
	31 Mar 2023 07:30	Pinempet	Indonesia	0.1
	31 Mar 2023 07:30	Buriai	Indonesia	0.1
	31 Mar 2023 08:45	Maoedoeloeng	Indonesia	0.1
	31 Mar 2023 08:30	Grajagan	Indonesia	0.1
	31 Mar 2023 08:30	Gradjagan	Indonesia	0.1
	31 Mar 2023 07:30	Batunong	Indonesia	0.1
	31 Mar 2023 11:45	Tungkaranasam	Indonesia	0.1
	31 Mar 2023 11:45	Sekapoeng	Indonesia	0.1
	31 Mar 2023 07:30	Tjilalang	Indonesia	0.1
	31 Mar 2023 07:30	Larompong	Indonesia	0.1
	31 Mar 2023 07:30	Kasiwiang	Indonesia	0.1
	31 Mar 2023 09:45	Yallingup	Australia	0.1
	31 Mar 2023 09:45	Dunsborough	Australia	0.1

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.