<Tr> <Th> Website </Th> <Td> Channel Islands National Park </Td> </Tr> <P> Channel Islands National Park is a United States national park that consists of five of the eight Channel Islands off the coast of the U.S. state of California, in the Pacific Ocean . Although the islands are close to the shore of densely populated Southern California, their isolation has left them relatively undeveloped . The park covers 249,561 acres (100,994 ha) of which 79,019 acres (31,978 ha) are owned by the federal government . The Nature Conservancy owns and manages 76% of Santa Cruz Island, the largest island in the park . </P> <P> Channel Islands National Park is home to a wide variety of significant natural and cultural resources . It was designated a U.S. National Monument on April 26, 1938, and a National Biosphere Reserve in 1976 . It was promoted to a National Park on March 5, 1980 . Channel Islands National Marine Sanctuary encompasses the waters six nautical miles around Channel Islands National Park . </P> <P> The Channel Islands were originally discovered in 1542 by the explorer Juan Rodríguez Cabrillo . In 1938 the Santa Barbara and Anacapa islands were designated a national monument . San Miguel, Santa Rosa and Santa Cruz islands were combined with the monument in 1980 to form modern - day Channel Islands National Park . </P>

When did channel islands became a national park