It's a Maze, you start in the centre and have to escape.
You can harvest food to sustain you on your journey, but that is all.
As a special treat - the solution to the maze will reveal itself at night.
But the days are long and the nights are very short.
This map also has a schematic file for the maze:
358 x 268
15 high, 2 deep.
Cheers,
Andrew.