Riwon is muntainous, although thare are sma plains an aw, an is hame tae the Taedok Muntains (대덕산맥). The heichest peak is Taedoksan (1,442 m). Thare are some 10 significant streams; the chief o these is the Namdaechon, which drains intae the Sea o Japan. Thare are various bays an islands alang the coast. Thanks tae its coastal location, the coonty enjoys a mild maritime climate. Forestland (70% o which is coniferous) taks up 73% o the coonty's aurie.