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<br />4 RIVER SYSTEM AND ITS FISHES <br /> <br /> <br />41'- <br /> <br />GREEN RIVER BASIN <br />SUBREGIONS 1- 5 <br /> <br />UPPER MAINSTEM <br />COLORADO RIVER <br />BASIN <br />SUBREGIONS 6 -11 <br /> <br />_ RIVER BASIN BOUNDARY <br /> <br />_ SUBREGION BOUNDARY <br /> <br />L ] NATIONAL PARKS,MONUMENTS, <br />AND RECREATION AREAS <br /> <br />---<::::. STREAMS AND RIVERS <br /> <br />TOWNS AND CITIES WITH <br />.. POPULATIONS OVER 1,000 <br /> <br />o SO <br />..... - ...... - <br /> <br />KILOMETERS <br /> <br />100 <br />- I <br /> <br />SAN JUAN RIVER BASIN <br />SUBREGION 12 <br /> <br />37.- <br /> <br />Fig. 1. The Upper Colorado River System in Colorado. The three major basins or <br />subbasins represented are further divided into twelve subregions. <br />