Talk:Mission: Road to the Marsh/@comment-2601:989:4202:E930:1A:AA53:9E6C:D2E1-20190217013901/@comment-38109392-20190217035623

I've tried to get into the area you need to go without going through the tree farm, but all sides are blocked by invisible walls.

There was some info and a few Team 17 comments in this thread, though I'm not sure if it'll apply to you since you're so far in the game. You need to get Mission: Panbat Infestation and finish a couple other missions after that to proceed. Some things that were recommended or helped other people in the thread:
 * Verifying game integrity
 * Completing Mission: Let There Be Light
 * Re-reading Dawa's letter asking for your help
 * Talking to Dawa

Dawa doesn't come out of the Tree Farm often, though he goes to weekly BBQs with his brothers at the Portia River near the western end of Amber Island. Not sure what day they have BBQs, sorry.

If none of that helps you, you can comment on that Steam thread and/or send an email to admin@pathea.net with an explanation of your issue and a copy of your save file (like described here.)