There is one place named Thorsteinson Island in Canada.
All places in the world called "Thorsteinson Island".
Wellington (4)
Windsor (4)
Saint Andrews (3)
Selkirk (3)
Tracadie (3)
Kingston (3)
Victoria (3)
Havelock (3)
Centreville (3)
Sidney (3)
Borden (3)
Princeton (3)
Westport (3)
Milton (3)
Richmond (3)
Benton (3)
Aylmer (2)
Burlington (2)
Clinton (2)
Echo Bay (2)
Greenwood (2)
La Salle (2)
Mount Pleasant (2)
Red Rock (2)
Saint Paul (2)
Stony (2)
Waugh (2)
Bellevue (2)
Caribou (2)
Cumberland (2)