Bear Lake is a natural freshwater lake on the Utah-Idaho border in the Western United States. It is the second largest natural freshwater lake in Utah[1] and has been called the "Caribbean of the Rockies" for its unique turquoise-blue color, the result of suspended limestone deposits in the water.[2] Its water properties have led to the evolution of several unique species that live naturally only within the lake.[3] Bear Lake is over 250,000 years old [4]. It was formed by fault subsidence that continues today, slowly deepening the lake along the eastern side.[5]