Formally XTERRA Tahoe City Tahoe California Off-Road Triathlon celebrates the natural environment of Lake Tahoe’s excellent terrain, trails, and blue water. One of the core events of Adventure Sports Week! The swim occurs in one of the clearest, cleanest, and deepest lakes in North America, Lake Tahoe. Tahoe City is also home to some of the area’s most treasured mountain biking trails. The bike course features single track and double track, fields of wildflowers, and breathtaking Sierra views. The races start and finish is at Commons Beach on the shore of Lake Tahoe.