The Mammoth Lakes Basin is a large glacial cirque basin that was carved by the grinding movement of glacial ice and rocks entrained within the ice. The lakes in the lower basin, including Lake Mary, Lake George, and Horseshoe Lake, fill depressions in glacial moraine deposits. Most lakes in the basin and many of the other over 100 nearby lakes were scooped out by glaciers. The town of Mammoth Lakes and all these lakes are part of the Sierra Nevada Mountain Range. The range stretches along the border between Nevada and California. Included in their majestic peaks are highlights such as Yosemite, Mt. Whitney (the highest peak in the continental USA) and Lake Tahoe (the deepest lake in the continental USA).