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Oregon Geography

Rugged cliffs (some over 1,000 ft. high) front Oregon's Pacific Ocean coastline, where the land then rises into the Coastal Mountain Range and the Klamath Mountains of the south; both a series of relatively low, heavily-forested peaks, punctuated by numerous small lakes.

Directly to the east of those mountains, the Willamette Lowlands stretch south from the Portland area about 175 miles. This fertile strip of land is dissected by the Willamette River which rises in the Cascades, to then flow north into the Columbia River.

East of the lowlands stand the majestic Cascades. This range of (volcanic in origin) peaks includes Mt. Hood, Oregon's highest point, as well as many other major mountains including Mt. Jefferson, Mt. McLoughlin and the Three Sisters. These forested mountains contain many lakes, including Crater Lake (America's deepest lake) at 1,932 feet deep.

The Columbia Plateau extends south from Washington to cover much of eastern Oregon. Formed by ancient lava flows, it's a landscape of deep, wide valleys and rugged mountains, including the Blue and Wallowa. Hell's Canyon, dissected by the Snake River on Oregon's border with Idaho, is the deepest gorge in America, with a maximum depth of 7,900 ft.

The Harney Basin, a part of the larger Great Basin region of the western United States, is an arid and flat stretch of land that has no natural outlet to the sea. Harney Lake, Malheur Lake and the Steens Mountains are its major features.

Oregon's most significant rivers are the British Columbia, Canada, then flows south through Washington to Oregon, forming most of the natural northern border between the two states. The Wyoming and flows all the way to the Columbia River in Washington State.

Other rivers of note include the Deschutes, John Day, Owyhee, Rogue and Willamette.

For a detailed look at the topography of Oregon, view this Landforms of America

  • Landforms of North America
  • Rivers of North America
  • Oregon Photographs

    Multnomah Falls, Columbia Gorge National Scenic Area, Oregon, USA

    Multnomah Falls in Columbia Gorge...
    by Charles Gurche
    Buy This at Allposters.com

    Oregon Cities, Counties & Area Codes

    City County Area Code
    Baker City Baker 541
    Corvallis Benton 541
    Portland Clackamas 503
    Astoria Clatsop 503
    Saint Helens Columbia 503
    Coos Bay Coos 541
    Prineville Crook 541
    Brookings Curry 541
    Bend Deschutes 541
    Roseburg Douglas 541
    Condon Gilliam 541
    John Day Grant 541
    Burns Harney 541
    Hood River Hood River 541
    Medford Jackson 541
    Madras Jefferson 541
    Grants Pass Josephine 541
    Klamath Falls Klamath 541
    Lakeview Lake 541
    Eugene Lane 541
    Newport Lincoln 541
    Albany Linn 541
    Ontario Malheur 541
    Salem Marion 503
    Boardman Morrow 541
    Portland Multnomah 503
    Salem Polk 503
    Wasco Sherman 541
    Tillamook Tillamook 503
    Hermiston Umatilla 541
    La Grande Union 541
    Enterprise Wallowa 541
    The Dalles Wasco 541
    Beaverton Washington 503
    Portland Washington 503
    Fossil Wheeler 541
    McMinnville Yamhill 503
    This page was last updated on April 7, 2017.