Ring diagram

Tumen is a county-level city in Yanbian Korean Autonomous Prefecture, eastern Jilin province, Northeast China. Of its 136,000 inhabitants, approximately 78,000 (or 57%) are of Korean descent. The two official languages are Chinese and Korean. Tumen is separated from Namyang of North Hamgyong province of North Korea by the Tumen River.

The Tumen Border Bridge (Chinese: 图们国境大桥) is a bridge over the Tumen River, connecting Tumen City, Jilin Province, China, with Onsong County (Namyang), North Hamgyong Province, North Korea. It was built in 1941 by the Japanese and is 515 metres long, 6 metres high, 6 metres wide. Tumen Border Post is located there.

The Gaya River (Chinese: 嘎呀河; pinyin: Gāyǎ Hé) is a tributary of the Tumen River in east Jilin province of China. The source of river is located in Wangqing County and flows generally from north to south and joins Tumen River at Tumen City.The river has a length of 205.2 km and drains an area of 13,565 square km.