A tower or structure containing a beacon light to warn or guide ships.

A floating object moored to the seabed in a charted place as a navigation aid or for other specific purpose.

A specified area designated by an appropriate authority within which navigation is restricted in accordance with certain specified conditions.

An area within which naval, military or aerial exercises are carried out also called an exercise area.

Depth obtained through sounding by means of any sounding equipment. 

An open body of water entirely surrounded by land either naturally formed or man-made

A barrier, together with appurtenant structures, constructed for the purposes of storage, control and diversion of water. A dam may be constructed across a natural watercourse or on the periphery of a reservoir.

A large inland body of water entirely surrounded by land either naturally formed or man made.

A relatively large natural stream of water.

The edge of a relatively large natural stream of water.