Il Wallula Gap è un ampio varco fluviale aperto dal fiume Columbia attraverso le anticlinali basaltiche del Gruppo basaltico del Columbia, nello Stato americano di Washington, appena a sud della confluenza tra i fiumi Walla Walla e Columbia.
È stato riconosciuto come National Natural Landmark dal National Park Service, in quanto sito che fornisce un'importante illustrazione della storia geologica degli Stati Uniti d'America.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
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