▁of ▁the ▁Ale ut ian ▁T rench ▁to ▁its ▁south . ▁ ▁What ▁remained ▁of ▁the ▁K ula ▁Pl ate ▁attached ▁to ▁the ▁North ▁American ▁Pl ate . ▁ ▁This ▁former ▁sub du ction ▁zone ▁is ▁now ▁the ▁Ber ing ian ▁Mar gin , ▁which ▁now ▁hosts ▁six teen ▁sub marine ▁can y ons , ▁including ▁Z hem ch ug ▁C any on , ▁the ▁world ' s ▁largest . ▁ ▁The ▁deep - water ▁part ▁of ▁the ▁Ber ing ▁Sea ▁is ▁separated ▁into ▁the ▁Commander ▁and ▁Bow ers ▁bas ins ▁by ▁the ▁sub marine ▁Sh ir sh ov ▁R idge ▁ ▁and ▁Bow ers ▁R idge . ▁The ▁Commander ▁Bas in ▁occup ies ▁the ▁western ▁part ▁of ▁the ▁Ber ing ▁Sea , ▁with ▁the ▁Sh ir sh ov ▁R idge ▁on ▁its ▁eastern ▁border . ▁The ▁Sh ir sh ov ▁R idge ▁extends ▁ 7 5 0   km ▁ ▁south ward ▁from ▁the ▁Russian ▁O ly utor sk ii ▁Pen ins ula ▁to ▁connect ▁with ▁Bow ers ▁R idge . ▁The ▁Bow ers ▁R idge ▁extends ▁in ▁the ▁form ▁of ▁an ▁arc ▁over ▁approximately ▁ 9 0 0   km ▁from ▁the ▁Ale ut ian ▁Islands ▁Arc ▁to ▁the ▁north western ▁term ination , ▁where ▁it ▁meets ▁Sh ir sh ov ▁R idge . ▁This ▁former ▁island ▁arc , ▁Bow ers ▁R idge , ▁is ▁a ▁prominent ▁semi - circ ular - sh aped ▁ge ological ▁that ▁meets ▁the ▁Ale ut ian ▁arc ▁and , ▁together ▁with ▁the ▁Ale ut ians