Uncommon
Baigong pipes
Feature near Delingha, Qinghai, China
Baigong pipes
The Baigong pipes, which are also known as 白公山铁管 (BaiGongShan Iron Pipes) and Delingha pipes, are a series of pipe-like fossilized tree roots found on and near White Mountain (Chinese: 白公山; pinyin: Báigōngshān 'Mount Baigong'), about 40 kilometers (25 mi) southwest of the city of Delingha, in the Haixi Mongol and Tibetan Autonomous Prefecture, Qinghai Province, China.
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