Thread:SlyCooperFan1/@comment-1689960-20190307130947/@comment-1824272-20190307163240

The issue here is that you're making assumptions based on personal belief. We can only go by canon facts on this wiki, and as such, it's Fort Grays Island.

"only a small island on the western part" is because of the quirk of the briefing map putting a marker in the middle of the region.