Like the Great Salt Lake in Utah or the Caspian Sea, Spotted Lake is endorheic. That means it’s contained within a closed basin, with no stream or river flowing out. Groundwater, snowmelt and rainfall fill this lake during the fall. But in the summer, when the air is hot and dry, most of the water evaporates, leaving behind shallow, mineral-rich pools separated from one another by crusty salts and minerals that precipitated in the process. The pools look like spots that range in color depending on the minerals inside them. The Okanagan First Nations people say Kliluk has a spot for each day of the year, but others estimate around 400 briny pools rich in sulfates, magnesium, titanium, sodium and other minerals adorn this lake in the summer.