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Islands of Southwestern British Isles and Western France on a Map

Name all the islands of the Celtic Sea, Bristol Channel, western English Channel and Bay of Biscay that have an area of over 1 km2.
Some islands are very small—click to zoom in! There are circles around the difficult-to-see islands.
SVG made from European Environment Agency coastline data. Thumbnail is from NASA Worldview.
Population figures are from Wikipedia. Areas of some islands measured using Google Earth; the rest are from Wikipedia.
Please leave a comment if you spot any mistakes, or if you know the population of the smallest island!
Quiz by
ultimatewazad
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Last updated: March 3, 2026
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First submittedMarch 3, 2026
Times taken10
Average score19.4%
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Island
Area (km²)
Population
Oléron
174
22,076
Jersey
120
103,267
Belle-Île
86
5,553
85
17,891
Guernsey
62
63,950
Great
53
14,000
Noirmoutier
49
9,590
Yeu
23
4,870
Ushant
16
860
Groix
15
2,310
Alderney
7.8
2,167
Cape Clear
6.7
110
St Mary's
6.6
1,723
Sark
5.5
562
Sherkin
5.0
110
Lundy
4.5
28
Houat
3.3
219
Moines
3.2
630
Island
Area (km²)
Population
Bréhat
3.1
429
Batz
3.1
458
Tresco
3.0
175
Skomer
2.9
0
Ramsey
2.6
2
Arz
2.6
321
St Martin's
2.4
135
Caldey
2.2
40
Hœdic
2.1
104
Grande
1.9
800
Long
1.8
17
Heir
1.5
29
Aix
1.4
209
Herm
1.4
60
Bryher
1.3
84
St Agnes
1.1
82
Skokholm
1.1
2
Chevalier
1.0
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