تعريف oregon caves national monument في الإنجليزية الإنجليزية القاموس.
National monument, southwestern Oregon, U.S. It is a single cave comprising a series of chambers joined by subterranean corridors on four levels. Located in the Siskiyou Mountains near the California border, the monument was established in 1909. It has an area of 488 acres (197 hectares). It contains many stalagmites, stalactites, and other formations