Crazy terrain and hyper-detail map

This is a fascinating m`p. The mapper must have been able to draw the vegetation from air photos. Some of the symbols are a bit odd. What are those brown lines near controls 46 and 47? What about the thin black lines along the streams? It looks like a very special, and very interesting, place. The Google image gives you a sense of the terrain. Thierry Gueogiou describes is as, "One of my