### Spotted Lake
Canada — When summer heat dries this Canadian lake, it transforms into a polka-dot mosaic of 400 colorful, crusty pools.
Spotted Lake (known as Khiluk to the Syilx Okanagan Nation) is an endorheic basin, meaning water flows in but can never flow out to the sea. Over thousands of years, rain and snowmelt have washed massive amounts of minerals from the surrounding volcanic hills into this single, inescapable spot.
When the intense summer heat of the valley hits, most of the lake's water evaporates. As the liquid vanishes, the dissolved minerals are left behind until they reach their saturation point. They crystallize and harden into raised, crusty walkways of calcium, sodium, and magnesium sulfate (better known as Epsom salt). These natural bridges divide the remaining brine into a massive, walkable grid of polka-dot puddles.
The 400 leftover pools look like an alien checkerboard, glowing in bizarre shades of vibrant yellow, pale green, and deep blue. The specific color of each puddle depends on its exact mineral cocktail and the specialized algae thriving inside. While visitors aren't allowed to touch the fragile ecosystem, indigenous peoples have long used the mud for healing. And science backs this up: the lake's massive concentration of natural Epsom salt is clinically proven to soothe skin and muscle inflammation.