From PathfinderWiki

Deepmar is a small coastal island 75 miles from the mainland of Ravounel. It is only a short boat ride away from the city of Vyre on Vyre Island. The closest coastal city is Kintargo. Its southern coast was formerly the site of a Chelish mining facility and penal colony,12 which has recently been discovered to be abandoned, and the few survivors mutter about the lights from below. On the darkest nights, Deepmar is crisscrossed by eerie lights originating from a tunnel network.3

The island is approximately 30 miles across at its widest point. It is covered by many stretches of forest and expansive meadows with tall grass and wildflowers.4