Advanced Geography . thward from the gulf of California wasonce covered by that body of water, but was cut offby the delta of the Colorado river. The region beingvery dry, the water in the old head of the gulf haslong since dried away, leaving a desert plain. Some-times a distributary from the Colorado river flowsinto the hollow and forms a temporary lake. The Basin region includes not only the GreatBasin, but also two smaller districts that are partlydrained to the sea. One of these is southeast, andthe other northwest, of the Great Basin. On themap {page 32) they are separated from the rest
Advanced Geography . thward from the gulf of California wasonce covered by that body of water, but was cut offby the delta of the Colorado river. The region beingvery dry, the water in the old head of the gulf haslong since dried away, leaving a desert plain. Some-times a distributary from the Colorado river flowsinto the hollow and forms a temporary lake. The Basin region includes not only the GreatBasin, but also two smaller districts that are partlydrained to the sea. One of these is southeast, andthe other northwest, of the Great Basin. On themap {page 32) they are separated from the rest ofthe Basin region by lightly-dotted lines. In the northwest part of the Basin region, themountains are so young that no deep valleys are yetworn in their sides. These mountains are edges ofhuge blocks, tilted like those shown in the shape of the blocks has hardly changed since the region was thus broken up. Lakes lie in the troughs between the tilted blocks. Most of the lakes have no overflow to the Colorado Plateau Region (page 37).
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