Most of eastern and southern Utah drains into the Colorado River system and eventually to the Gulf of California, an arm of the Pacific Ocean. The rest of the state, however, lies within a huge internal drainage system that has no outlet to the sea. The Colorado River flows across southeastern Utah, receiving a major tributary, the Green River, when it is nearly midway in its course across the state. Major streams that drain into the Great Basin are the Bear, Weber, Ogden, Jordan, Provo, Spanish Fork, and Sevier rivers. A very small portion of northwestern Utah drains into the Columbia River system by way of the Raft River.
The largest of Utah’s lakes is the famous Great Salt Lake. The largest inland body of salt water in North America, it is the largest remnant of the once extensive Lake Bonneville, which covered much of Utah and Nevada in prehistoric times. The Great Salt Lake is several times more saline than the oceans. It varies in volume and salinity according to the amount of water that it receives from streams flowing out of the Wasatch Range in the east. Other, smaller natural lakes include Utah Lake, which drains into Great Salt Lake by way of the Jordan River. Huge reservoirs rival the natural lakes in size. Among them is Lake Powell, which lies behind Glen Canyon Dam on the Colorado River and is partly in Arizona. "Utah" © Emmanuel BUCHOT, Encarta, Wikipedia
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