A view of Tonghai county seat from west-north-west
Location of Tonghai County (pink) and Yuxi Prefecture (yellow) within Yunnan province of China
|• Total||1,114 km2 (430 sq mi)|
|• Density||230/km2 (610/sq mi)|
Tonghai County occupies the fertile valley of Qilu Lake, surrounded on all sides by mountains. The county seat is located on the south side of the lake, separated from the lake by a mile-wide strip of farmland.
The county' southernmost part, including the Dagao Dai and Yi Ethnic Township and Lishan Yi Ethnic Township, is separated from the rest of the county by mountains; it is outside of the Qilu Lake basin, and is drained into the Qu River instead.
In 1970, a powerful earthquake struck the area.
Soon after the formation of PRC, the area of today's Tonghai County was organized as two counties: Tonghai and Hexi (in the western part of today's Tonghai County). The two counties were merged into Qilu County (杞麓县) on November 22, 1956. On October 22, 1959, Qilu County was renamed Tonghai County.
- Yuxi–Mengzi Railway (a section of the standard gauge Kunming–Hekou Railway). The passenger station, Tonghai Station, is located near Hexi Town, a few kilometers west of the county seat.
- 通海历史大事件—中华人民共和国 (Big events in the history of Tonghai County, P.R.C.)
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