I was wondering if any of you guys know any information concerning who owns the islands, who inhabits them or what they are used for.
The island in the Topal Bay is called, wait for it, http://www.reddit.com/r/elderscrollsonline/comments/2g0x5l/ama_with_the_eso_writing_team/cker77o. As for the one in the Abecean, do you mean http://www.imperial-library.info/sites/default/files/imagecache/node-gallery-display/gallery_files/tamriel_westmap.jpg?
We've got no official info on Topal Isle. Stirk appears to be owned by Cyrodiil in the late 3rd era, and by no one in the mid 2nd. There's an Ayleid ruin on it that's used as neutral ground between the three alliances.