Riwon County

 county, second-level administrative division, draw only border

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(리원군/利原郡)
Riwon (also spelled Iwon) is a county in South Hamgyong province, North Korea. It is located at the province's northeastern tip, and borders the Sea of Japan (East Sea of Korea) to the southeast.

Riwon is mountainous, although there are also small plains, and is home to the Taedok Mountains. The highest peak is Taedoksan (1,442 m). There are some 10 significant streams; the chief of these is the Namdaechon, which drains into the Sea of Japan. There are various bays and islands along the coast. Thanks to its coastal location, the county enjoys a mild maritime climate. Forestland (70% of which is coniferous) takes up 73% of the county's area.

Machine manufacturing dominates the local economy, accounting for half of annual industrial production. Deposits of iron, iron sulfide, talc, limestone, graphite, quartzite and silica are found in the county. The Riwon Mine produces talc. Agriculture is carried out in the plains and along the streams; major crops include rice, soybeans, and maize.

Riwon is served by roads, and also by railroads such as the Pyongra Line, Riwon-Cholsan Line, and Chaho Line.