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The Columbia River Basin occupies a large portion of the northwest corner of the continental United States.
1) Identify the three major rivers in the Columbia Basin.
2) Identify the mountain ranges that form the rim of the basin that drains to the Pacific Ocean at the mouth of the Columbia near Astoria, Oregon.
3) Turn on the Lewis & Clark Trail layer in the map. The red route represents the expedition's westward journey. As you can see by following the route, Lewis and Clark entered the Columbia drainage south and west of Butte, Montana. Switch to an imagery or the topographic basemap and zoom in on the area where they crossed into the Columbia Basin. Describe the topography of the region and explain how you know that they were crossing a divide from one river basin to another - in fact, the Continental Divide.
4) Notice in the map that the northern boundary of the Columbia Basin is shown along the United States - Canada border and that obviously the Columbia River continues into Canada. Print a copy of the map so that Britsh Columbia is included and sketch on it the actual boundary of the Columbia River Basin beyond the Canadian border. Be prepared to explain how you determined the boundary.