Inlet

Part of speech: noun (n.)

1. A passage by which an inclosed place may be entered; a place of ingress; entrance. Doors and windows,inlets of men and of light. Sir H. Wotton.

2. A bay or recess,as in the shore of a sea, lake, or large river; a narrow strip of water running into the land or between islands.

3. That which is let in or inland; an inserted material.