Geographic location
Andreas
41
Mid-Atlantic Ridge
Ricardo
38
Rockall Trough
18
Perrier
16
Gage
12
Pacific
10
Paterson
10
Reykjanes
10
Grieg
6
Greenland
4
Indian
4
Pawson
4
Sladen
4
Antarctic
2
Argentina
2
Bridge Between the Continents
2
Marcos
2
Maria Island
2
Nantucket
2
Nils
2
Patagonia
2
Perez
2
Porcupine Seabight
2
Recta
2
Southern Ocean
2
Fiji Island
1