Jazirat Alburunz

From the publishers blurb:

Jazirat Alburunz is several weeks sailing from the nearest inhabited island chain to the North and over a month’s sailing from the mainland to the East. The island has long been uninhabited, the reason for its desertion unclear, some say a curse; others a disease. Now, only a lone nun tends to a monastery, with two castaways are the only humanoid occupants. Adventurer awaits intrepid explorers from the mysterious peak where a golden light can be seen, to the swamps and jungles.