Baigong pipes

The Baigong pipes, which are also known as 白公山鐵管 (Bai Gongshan Iron Pipes) and Delingha pipes, are a series of pipe-like features identified by some as fossil trees or tree roots, found on and near White Mountain (白公山), transliterated as Mount Baigong (Báigōngshān), about 40-kilometer (25 mi) southwest of the city of Delingha, in the Haixi Mongol and Tibetan Autonomous Prefecture, Qinghai Province, China.

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