I can't figure out what to do next. I finished Isis and revived Anephes. I have the treasure map but I can't figure out where the treasure is supposed to be. I could really use some specific directions since my boat is stuck under some trees and my party has to swim everywhere.

Did you find the second exit (beyond the room where the pillar fell over)? Anephas should have told you to find the three tablets in Collasium, and use them to get into the temple of Cet?