A valley made of calcium
Huanglong is a 7.5-kilometre staircase of travertine pools, built by water depositing calcium at every step.
Huanglong's valley floor is a staircase of calcium pools. The site is both a World Heritage property and a biosphere reserve.
Huanglong is a 7.5-kilometre staircase of travertine pools, built by water depositing calcium at every step.