Oceanic trench the level of the surrounding oceanic floor. The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km/yr. There are approximately of convergent plate margins, mostly around the Pacific Ocean—the reason for the reference “Pacific-type” margin—but they are also in the eastern Indian Ocean, with relatively short convergent margin segments in the Atlantic Ocean and in the Mediterranean Sea. Globally, there are over 50 major ocean trenches covering an area of 1.9 million km or about 0.5%
Battle of the Trench the Banu Qurayza tribe, leading to their surrender and enslavement or execution. The defeat caused the Meccans to lose their trade and much of their prestige. The battle is named after "trench", or "khandaq", that was dug by Muslims in preparation for the battle. The word "khandaq" () is the Arabised form of the Persian word "kandak" (meaning "that which has been dug"). Salman farsi the Persian advised Muhammad to dig a trench around the city. The battle is also referred to as the "Battle of Confederates" (). The Qur'an uses the term "confederates" () in sura "Al-Ahzab" to denote