Geographic location
Antarctic
8
Austin
Merrick
8
Pacific
Ridley
8
Weddell
Weddell Sea
8
Canada
4
Charcot
4
Custodio
4
Drake Passage
4
Goodwin
4
Greenland
4
Indian
4
New Zealand
4
Ramirez
4
Southern Ocean
4
The Antarctic
4
Thurston
4
Alvarez
2
Arctic
2
Bering Sea
2
Bouvet
2
Burton
2
Christchurch
2
Christiania
2
Holdfast
2
Hut Point
2
Inaccessible Island
2
McMurdo Sound
2
Okhotsk
2
Svalbard
2
Tristan
2
Valentine
2
Wilkinson
2