The Salton Sea, one of the largest inland seas on Earth, is the product of both natural and artificial forces. The sea occupies the Salton Basin, a remnant of prehistoric Lake Cahuilla. Over the centuries the Colorado River flooded the basin and the water drained into the Gulf of California. In 1905 a flood once again filled the Salton Basin, but the exit to the gulf was blocked by sediment. The floodwaters remained in the basin, creating a saline lake 228 feet below sea level, about 35 miles long and 15 miles wide, with a surface area of nearly 380 square miles. The sea, which lies along the Pacific Flyway, supports 400 species of birds. Fishing for tilapia, boating, camping, and bird-watching are popular activities year-round.