# List of National Natural Landmarks in Washington

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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 | Date | Location | County | Ownership | Description |
| Boulder Park and McNeil Canyon Haystack Rocks | 1986 | 47°52′43″N 119°48′06″W﻿ / ﻿47.878611°N 119.801667°W﻿ / 47.878611; -119.801667 | Douglas | Federal, state | The most illustrative examples of glacial erratics in the United States. |
| Davis Canyon | 1986 | 48°14′38″N 119°45′06″W﻿ / ﻿48.243775°N 119.751774°W﻿ / 48.243775; -119.751774 | 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 | 1986 | 46°58′30″N 119°11′47″W﻿ / ﻿46.975°N 119.196389°W﻿ / 46.975; -119.196389 | 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 | 1965 | 46°56′56″N 120°00′10″W﻿ / ﻿46.948889°N 120.002778°W﻿ / 46.948889; -120.002778 | Kittitas | State | Thousands of logs petrified in lava flows. Part of Ginkgo/Wanapum State Park. |
| Grand Coulee | 1965 | 47°46′00″N 119°13′00″W﻿ / ﻿47.766667°N 119.216667°W﻿ / 47.766667; -119.216667 | Grant | Federal, state, private | An illustration of a series of geological events. |
| Grande Ronde Feeder Dikes | 1980 | | Asotin | Private | The best example of basalt dikes, the congealed feeder sources of the Columbia River basalt plateau. |
| Grande Ronde Goosenecks | 1980 | | Asotin | Federal | A 1,500-foot (460 m) deep canyon that follows a tortuous path along meanders. |
| The Great Gravel Bar of Moses Coulee | 1986 | 47°27′30″N 119°48′00″W﻿ / ﻿47.458333°N 119.8°W﻿ / 47.458333; -119.8﻿ (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 | 2011 | | Franklin | State | The best remaining example of the Central Palouse Prairie grassland subtheme. |
| Mima Mounds | 1966 | 46°53′N 123°03′W﻿ / ﻿46.89°N 123.05°W﻿ / 46.89; -123.05﻿ (Mima Mounds) | Thurston | State | A prairie containing unusual soil pimples of black silt-gravel. |
| Nisqually Delta | 1971 | 47°06′31″N 122°42′11″W﻿ / ﻿47.108611°N 122.703056°W﻿ / 47.108611; -122.703056﻿ (Nisqually Delta) | Pierce, Thurston | Federal, state, tribal, private | An unusually fine example of an estuarine ecosystem. Includes Nisqually National Wildlife Refuge. |
| Point of Arches | 1980 | 48°14′47″N 124°42′01″W﻿ / ﻿48.2464503°N 124.7002419°W﻿ / 48.2464503; -124.7002419﻿ (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 | 1984 | | 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 | 1986 | 47°49′30″N 119°22′00″W﻿ / ﻿47.825°N 119.366667°W﻿ / 47.825; -119.366667 | 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 | 1965 | 47°01′57″N 117°17′55″W﻿ / ﻿47.0325°N 117.298611°W﻿ / 47.0325; -117.298611 | Whitman | State, county, private | Isolated mountain peaks of older rock surrounded by basalt, rising above the surrounding lava plateau. |
| Umtanum Ridge Water Gap | 1980 | 46°51′00″N 120°32′40″W﻿ / ﻿46.85°N 120.544444°W﻿ / 46.85; -120.544444 | Kittitas | Federal, state, private | Geologic formation that illustrates the processes of tectonic folding and antecedent stream cutting. |
| Wallula Gap | 1980 | 46°02′40″N 118°56′48″W﻿ / ﻿46.044444°N 118.946667°W﻿ / 46.044444; -118.946667 | 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 | 1980 | 47°41′15″N 119°37′29″W﻿ / ﻿47.6875°N 119.624722°W﻿ / 47.6875; -119.624722 | Douglas | Federal, private | The best examples of drumlins and the most illustrative segment of the only Pleistocene terminal moraine in the Columbia Plateau |