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The Mariana Trench is 1,580 miles (2,542 kilometers) long â more than five times the length of the Grand Canyon. However, the narrow trench averages only 43 miles (69 km) wide. Because Guam is a U.S. territory and the 15 Northern Mariana Islands are a U.S. Commonwealth, the United States has jurisdiction over the Mariana Trench.
Challenger II returned to the spot with an echo-sounder and measured a depth of nearly 7 miles (11 kilometers). The majority of the Mariana Trench is now a U.S. protected zone as part of the Marianas Trench Marine National Monument, established by President George W. Bush in 2009.Permits for research in the monument, including in the Sirena Deep, have been secured from the U.S. Fish and Wildlife Service.hallenger II returned to the spot with an echo-sounder and measured a depth of nearly 7 miles (11 kilometers). The majority of the Mariana Trench is now a U.S. protected zone as part of the Marianas Trench Marine National Monument, established by President George W. Bush in 2009.