n. 25B6; noun DITCH, channel, trough, excavation, furrow, rut, conduit, cut, drain, waterway, watercourse; earthwork, entrenchment, moat; Archaeology fosse. See list.
Deepest Ocean Trenches
trench ocean
Bonin Pacific
Izu Pacific
Java Indian
Kermadec Pacific
Kuril Pacific
Mariana Pacific
New Britain Pacific
Philippine Pacific
Puerto Rico Atlantic
South Sandwich Atlantic
Tonga Pacific