Which preposition to use with imbros

after Occurrences 1%

* I did not leave Imbros after that during four years, except for occasional brief trips to the coastto Kilid-Bahr, Gallipoli, Lapsaki, Gamos, Rodosto, Erdek, Erekli, or even once to Constantinople and Scutariif

from Occurrences 1%

The book in which I wrote I had lost in the cabin of the Speranza, and yesterday, returning to Imbros from an hour's aimless cruise, discovered it there behind a chest.

Which preposition to use with  imbros