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%
Podtatrzański Trench glacial periods. The western part and eastern borderlands of the Podtatrzański Trench are forested. The main brooks that drain through the valley are the Czarny Dunajec, as well as the Zakopianka and Poroniec (sourced from the Biały Dunajec). The region is characterised by the settlement areas of Zakopane, as well as Kościelisko, Małe Ciche and Murzasichle. Podtatrzański Trench Podtatrzański Trench (Polish: Rów Podtatrzański; Slovakian: Podtatranská brázda) (514.14) - a mesoregion located below the Tatra Mountains, part of the Orava-Podhale Depression. The trench divides the Choč and Tatra Mountains from the Spisko-Gubałowski Plateau. The region is located between 700 and 1000