In comparison to aerial imagery these contours are very rough

Aside from the fact that here are many self-intersection, I am not able to verify the shapes of these areas on the basis of MapBox aerial imagery which is stated as source. Maybe the imagery changed but now the contours seem to be fairly arbitrary.

Fixed the self-intersected contour of the lake, but I am not sure if there is realy a lake. In addition here a some other curious contributions, like trees as animal park etc.