Only the main landmarks are marked on the map. the rivers, lakes, and railroads are not the only ones that exist.
Climate: everything south of the main mountain range is desert save the southwest portion, Genshi, that begins at th area where it looks like the mountains form a mouth. Genshi of course if a temperate forest. the northern portion is the dark forests of bassai up to, again, the northern mouth made of mountains. that is where Ryoufuu's climate starts. Munashii begins at the swamp.
Suibi is a lakeside resort in river clan
the impact crater is where the black forest began, the rock that impacted there is long since gone.