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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.
Answer: The ocean's deepest area is the Mariana Trench (also called the Marianas Trench), which is about 11 km (almost 7 miles, or almost 36,000 feet) deep. The trench is 1,554 miles long and 44 miles wide, and is like the Grand Canyon of the ocean, although it is 120 times larger.he Challenger Deep lies along the southern end of the Mariana Trench near the Mariana Islands. Various measurements have been taken of the ocean's depth at the Challenger Deep, but it is usually described as about 11,000 meters deep, or close to 7 miles beneath the ocean's surface.