The term 'Narrow Passage of Water' can be described by two crossword solutions: STRAIT (6 letters) and INLET (5 letters). A STRAIT is a narrow body of water that connects two larger bodies of water, such as two seas or an ocean and a sea. An INLET is a narrow body of water that is surrounded by land on three sides, such as a bay or a cove. Both straits and inlets are typically characterized by shallow waters and strong currents.