List of National Natural Landmarks in Washington

There are 18 National Natural Landmarks in the U.S. state of Washington, out of nearly 600 National Natural Landmarks in the United States.

Name	Image	Date	Location	County	Ownership	Description
Boulder Park and McNeil Canyon Haystack Rocks				Douglas	Federal, state	The most illustrative examples of glacial erratics in the United States.
Davis Canyon				Okanogan	State, private	One of the largest and least disturbed examples of antelope bitterbrush-Idaho fescue shrub steppe remaining in the Columbia Plateau.
Drumheller Channels				Adams, Grant	Federal, state, private	Illustrates the dramatic modification of the Columbia Plateau volcanic terrain by late Pleistocene catastrophic glacial outburst floods. Includes Columbia National Wildlife Refuge.
Ginkgo Petrified Forest				Kittitas	State	Thousands of logs petrified in lava flows. Part of Ginkgo/Wanapum State Park.
Grand Coulee				Grant	Federal, state, private	An illustration of a series of geological events.
Grande Ronde Feeder Dikes				Asotin	Private	The best example of basalt dikes, the congealed feeder sources of the Columbia River basalt plateau.
Grande Ronde Goosenecks				Asotin	Federal	A deep canyon that follows a tortuous path along meanders.
The Great Gravel Bar of Moses Coulee				Douglas	State, private	Largest and best example of a pendent river bar formed by catastrophic glacial outburst floods that swept across the Columbia Plateau.
Kahlotus Ridgetop				Franklin	State	The best remaining example of the Central Palouse Prairie grassland subtheme.
Mima Mounds				Thurston	State	A prairie containing unusual soil pimples of black silt-gravel.
Nisqually Delta				Pierce, Thurston	Federal, state, tribal, private	An unusually fine example of an estuarine ecosystem. Includes Nisqually National Wildlife Refuge.
Point of Arches				Clallam	Federal	An outstanding exhibit of sea action in sculpturing a rocky shoreline. A unit of Olympic National Park.
Rose Creek Preserve				Whitman	Private	The best remaining example of the aspen phase of the hawthorne-cow parsnip habitat type in the Columbia Plateau. Managed by The Nature Conservancy.
Sims Corner Eskers and Kames				Douglas	Federal, state, private	The best examples in the Columbia Plateau of landforms resulting from stagnation and rapid retreat of the ice sheet during the last glaciation.
Steptoe and Kamiak Buttes				Whitman	State, county, private	Isolated mountain peaks of older rock surrounded by basalt, rising above the surrounding lava plateau.
Umtanum Ridge Water Gap				Kittitas	Federal, state, private	Geologic formation that illustrates the processes of tectonic folding and antecedent stream cutting.
Wallula Gap				Benton, Walla Walla	Federal, state, county, municipal	The largest and most spectacular of several large water gaps through basalt anticlines in the Columbia River basin.
Withrow Moraine and Jameson Lake Drumlin Field				Douglas	Federal, private	The best examples of drumlins and the most illustrative segment of the only Pleistocene terminal moraine in the Columbia Plateau