Inlet
IN'LET, noun [in and let.] A passage or opening by which an inclosed place may be entered; place of ingress; entrance. Thus, a window is an inlet for light into a house; the senses are the inlets of ideas or perceptions into the mind.
1. A bay or recess in the shore of the sea or of a lake or large river, or between isles.
In limine, [Latin] at the threshold; at the beginning or outset.