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<br />10 <br /> <br />. <br /> <br />.....r;r-- <br />i:.i~LJ <br /> <br />'hus is esp,]ciaUy true of the Roc!ey IIoUl1tains i:l north <br /> <br />cantral Color~do, 2~Q for this r8ason th0 run-off from thc,t <br /> <br />region is fer ,'7eat8r in proportion to ax::a than that of any <br /> <br />other part of the basin. <br /> <br />The lower third of t:i) be..;in i G cOl!rpasGd mainly of hot, <br /> <br />arid plains of low altitcuie" brol3n here llild there by occasional <br /> <br />short mOUIltain groups or ranges reaching elevations of 3,000 to <br /> <br />6,000 feot. TllG ~enti\al portion of the b"-sLl is", high platea'L' <br /> <br />thl'ougb ';mich tr..'-l 3tr'3ar.J,~ ha.v..3 cut narrO\1 canyon3 often of gj,"eat <br /> <br />dept.'1. ",vary tributary '~hrou:;;" tilis region is in ca."'Yon, so that <br /> <br />- <br />much of the contral omd uP!'"'- pilrt of the ba3in is travCJrsc:d by <br /> <br />de 811 gorges and is exceedingly rough. At its @Quth the river has <br /> <br />. <br /> <br />buil t up a great de H" fro," the, material s "roeled in th3 canyons <br /> <br />described, and. has by thi" means ',Llcroa.cned uIJon tho Gulf of <br /> <br />California at its mouth "~1d fin.;:.lly cut off th3 oll!,or and of <br /> <br />this gulf entirely. Tna isolated portion forming a de"p depres- <br /> <br />sion b310w sea level, is lnovm as the Salton Basin u:':i includ<3s <br /> <br />thu Imparial V!l.ll<3Y of 3I'cat 3xtant <'CuJ remarkabla fertility, <br /> <br />with a salin3 l~{a in the cottom, known as Salton Sea. <br /> <br />Ths area of the drainage basin of th" Colorado River of <br /> <br />appro:-:imately 244,000 s'iuare mil3s, is di-,ided amon!"; the politi- <br /> <br />cal divisions as follows: <br /> <br />. <br />