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SOME DESERT watering PLACES IN SOUTHEASTERN CALIFORNIA AND SOUTHWESTERN NEVADA. By Walter C. Mendenhall. INTRODUCTION. AREA CONSIDERED. This report relates especially to the southwestern part of the Great Basin—the portion of it that is bounded on the west by the Sierra Nevada and Sierra Madre, on the east by Colorado River, on the south by Mexico, and on the north by the parallel between Tps. 4 and 5 S. of the Mount Diablo base line. It includes the arid portions of southeastern California and those adjacent parts of Nevada that are most easily reached from California points. This region is known generally to the dwellers in the less arid districts west of the Sierra as "the desert," but local names are applied to its various subdivisions. Among the more important of the subdivisions are the Colorado and Mohave deserts and the Death Valley region. The Colorado Desert is that definitely limited arid valley which extends from San Gorgonio Pass southward to the Gulf of California, and includes the depression known as the "Salton Sink." The Mohave Desert lies farther north and its boundaries are not so definite, but it includes much the greater part of San Bernardino County and the eastern portions of Los Angeles and Kern counties, Cal. The Death Valley region, which lies north of the Mohave Desert, stretches eastward from the Sierra Nevada, covering a large part of Inyo County, Cal., and extending into Nevada. It is named from its central feature, Death Valley, the lowest point on the continent. The desert region outlined above and shown on the accompanying map (Pl. I) covers an area of about 68,000 square miles. The wells and springs within it are few in number and are very irregularly distributed. In some districts watering places occur in groups; in other tracts they are 30 to 50 miles apart. So irregular is their distribution that it is important that they should be located as definitely as possible and described for the benefit of prospectors and other travelers. The scarcity of water and the importance of a knowledge

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