abyssal plain

An abyssal plain is a vast, flat, and deep area of the ocean floor, typically found between 3,000 and 6,000 meters below the surface. Covering large portions of the Earth's seabed, these plains are formed by the accumulation of fine sediments that settle over ancient mountain ranges or submerged geological features. They are among the flattest, most expansive terrains on Earth and host various deep-sea life adapted to extreme conditions. Abyssal plains play a key role in Earth's ecology and are important for understanding geological processes like plate tectonics and sedimentation.