<Tr> <Td_colspan="2"> Released in 2005 </Td> </Tr> <Tr> <Td_colspan="2"> Lists of United States state symbols </Td> </Tr> <P> Oregon (/ ˈɔːrɪɡən / (listen)) is a state in the Pacific Northwest region on the West coast of the United States . The Columbia River delineates much of Oregon's northern boundary along Washington state, while the Snake River delineates much of its eastern boundary along Idaho . The parallel 42 ° north delineates the southern boundary with California and Nevada . Oregon is one of only three states of the contiguous United States to have a coastline on the Pacific Ocean . </P> <P> Oregon was inhabited by many indigenous tribes before Western traders, explorers, and settlers arrived . An autonomous government was formed in the Oregon Country in 1843 before the Oregon Territory was created in 1848 . Oregon became the 33rd state on February 14, 1859 . Today, at 98,000 square miles (250,000 km), Oregon is the ninth largest and, with a population of 4 million, 27th most populous U.S. state . The capital, Salem, is the second most populous city in Oregon, with 164,549 residents . Portland, with 632,309 residents, is the most populous and ranks as the 26th most populous city in the United States . The Portland metropolitan area, which also includes the city of Vancouver, Washington, to the north, ranks the 23rd largest metro area in the nation, with a population of 2,389,228 . </P>

What is the name of the river that forms the northern border of oregon