<P> Per a 2014 report, over 7,000 locations within the Portland area are at high - risk for landslides and soil liquefaction in the event of a major earthquake, including much of the city's west side (such as Washington Park) and sections of Clackamas County . </P> <P> Portland is 60 miles (97 km) east of the Pacific Ocean at the northern end of Oregon's most populated region, the Willamette Valley . Downtown Portland straddles the banks of the Willamette River, which flows north through the city center and separates the city's east and west neighborhoods . Less than 10 miles (16 km) from downtown, the Willamette River flows into the Columbia River, the fourth - largest river in the United States, which divides Oregon from Washington state . Portland is approximately 100 miles (160 km) upriver from the Pacific Ocean on the Columbia . </P> <P> Though much of downtown Portland is relatively flat, the foothills of the Tualatin Mountains, more commonly referred to locally as the "West Hills", pierce through the northwest and southwest reaches of the city . Council Crest Park, commonly thought of as the highest point within city limits, is in the West Hills and rises to an elevation of 1,073 feet (327 m) The city's actual high point is a little - known and infrequently accessed point (1,180 feet) near Forest Park . The highest point east of the river is Mt . Tabor, an extinct volcanic cinder cone, which rises to 636 feet (194 m). Nearby Powell Butte and Rocky Butte rise to 614 feet (187 m) and 612 feet (187 m), respectively . To the west of the Tualatin Mountains lies the Oregon Coast Range, and to the east lies the actively volcanic Cascade Range . On clear days, Mt . Hood and Mt . St. Helens dominate the horizon, while Mt . Adams and Mt . Rainier can also be seen in the distance . </P> <P> According to the United States Census Bureau, the city has an area of 145.09 square miles (375.78 km), of which 133.43 square miles (345.58 km) is land and 11.66 square miles (30.20 km) is water . Although almost all of Portland is within Multnomah County, small portions of the city are within Clackamas and Washington Counties, with populations estimated at 785 and 1,455, respectively . </P>

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