A massive deep-sea ravine in the Pacific Ocean has been mapped out in greater detail than any other part of the world's seafloor. The new maps of the "deep-sea Grand Canyon" have a "centimeter-scale resolution" and reveal exactly how the underwater valley is constantly changing.
The Monterey Canyon begins just off the coast in Monterey Bay, California. It extends more than 292 miles (470 kilometers) beneath the waves and is around 7.5 miles (12 km) across at its widest point. The underwater ravine has walls up to 5,580 feet (1,700 meters) tall, and at its deepest point the seafloor is around 2.5 miles (4 km) below the ocean's surface.
