![Oregon's borders with Washington and Idaho are mostly bounded by the Columbia and Snake rivers. But the border breaks due east just a few miles downstream of the confluence of those rivers. Oregon's borders with Washington and Idaho are mostly bounded by the Columbia and Snake rivers. But the border breaks due east just a few miles downstream of the confluence of those rivers.](http://kezj.com/files/2016/04/Snake-River-Trace-via-USGS.png?w=630&h=443&zc=1&s=0&a=t&q=89)
Oregon's borders with Washington and Idaho are mostly bounded by the Columbia and Snake rivers. But the border breaks due east just a few miles downstream of the confluence of those rivers.
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