an indentation of a shoreline, usually long and narrow; small bay or arm.

a narrow passage between islands.

a place of admission; entrance.

something put in or inserted.

to put in; insert.

noun

basin , bay , bayou , bight , canal , channel , cove , creek , delta , entrance , estuary , firth , fjord , gulf , harbor , ingress , loch , narrows , passage , slew , slough , sound , strait , arm , fiord , frith , inlay , opening , orifice , recess , ria , stream , waterway