| has gloss | eng: |class="wikitable sortable" align="center" ! ! Name ! Image ! Date ! Location ! County ! 'Description |- | 1 | Boulder Park and McNeil Canyon Haystack Rocks | | | | Douglas County | The most illustrative examples of glacial erratics in the United States. |- | 2 | Davis Canyon | | | | Okanogan | One of the largest and least disturbed examples of antelope bitterbrush-Idaho fescue shrub steppe remaining in the Columbia Plateau. |- | 3 | Drumheller Channels | | | | Adams, Grant | Illustrates the dramatic modification of the Columbia Plateau volcanic terrain by late Pleistocene catastrophic glacial outburst floods. |- | 4 | Ginkgo Petrified Forest | | | | Kittitas | Thousands of logs petrified in lava flows. |- | 5 | Grand Coulee | | | | Grant | An illustration of a series of geological events. |
