The Tonga Trench is a deep oceanic trench located in the South Pacific Ocean, near the islands of Tonga and Fiji. It is one of the deepest parts of the world's oceans, reaching depths of over 10,800 meters (35,400 feet). The trench is formed by the subduction of the Pacific Plate beneath the Indo-Australian Plate, making it a significant geological feature. This trench is not only important for its depth but also for its role in tectonic activity. It is associated with frequent earthquakes and volcanic activity in the region, contributing to the formation of the Tonga Arc, a series of volcanic islands. The trench is a key area for studying plate tectonics and marine ecosystems.