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Pyramid Lake,188 sq mi (487 sq km), W Nev. The lake, a remnant of ancient Lake Lahontan, receives the Truckee River. Visited (1844) by U.S. explorer John FrémontFrémont, John Charles,
1813–90, American explorer, soldier, and political leader, b. Savannah, Ga. He taught mathematics to U.S. naval cadets, then became an assistant on a surveying expedition (1838–39) between the upper Mississippi River and the Missouri.
..... Click the link for more information. , the lake was named for its large pyramidal rocks. It is located in the Pyramid Lake (Native American) reservation. In the lake is Anaho Island, a national wildlife refuge.