part of the North Korean mountains to the west of the drainage divide of the Nangnim mountain range.
The highlands are composed chiefly of ancient intrusive rock and consist of tablelands and mountain ranges of the northeastern extension (Myohyang, Nangnim, and others), with elevations to 1,909 meters. Level surfaces are widely distributed. The highlands are strongly separated by the Chongchon and Taedong Rivers, which are left tributaries of the Yalu Kiang (Amnok-Kang) River. There are deposits of lead-zinc ores, gold, and graphite. A temperate monsoon climate prevails with cold, dry winters. Yearly precipitation is above 1,000 mm and occurs mainly during the summer. There are mountain taiga and mixed forests (larch, silver fir, oak, maple, and others).