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Photo: No machine-readable author provided. Williamborg assumed (based on copyright claims)., Public domain via Wikimedia Commons
A 27 mi reservoir in the northern portion of the Grand Coulee, a formerly dry coulee near the Columbia River, formed by the Missoula Floods.
Banks Lake is a 27-mile-long (43 km) reservoir in central Washington in the United States.
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At the foot of Dry Falls. Offers camping and lakefront shoreline. During the last ice age, Dry Falls occasionally carried more water by volume than all the rivers of the world combined (known as the Missoula Flood).
These caves on the Grand Coulee were formed by water erosion on volcanic rock, which makes them geologically interesting. The site is a far-flung extension of Sun Lakes-Dry Falls State Park.