[Answer] Where are these colorful calcite pools?

Step 1 : Introduction to the question "Where are these colorful calcite pools?"

...1. China 2. Bolivia 3. Croatia 4. Argentina

Step 2 : Answer to the question "Where are these colorful calcite pools?"

China - China is home to the Huanglong Scenic Reserve, which is part of Huanglong National Park. There, a stunning set of sapphire pools, called travertine pools, are scattered in the mountains. Known as the Yellow Dragon Gully, the pools curve for 2.25 miles, like the scales of a golden dragon. Surrounded by thick forest and glaciers, the colorful series of pools and waterfalls contain deposit patterns of layered calcium carbonate. The color of the pools changes according to season — appearing either brown, yellow, green, or blue — all of which you can experience by walking the boardwalk trail along the travertine.:

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