➡ a barrier built across a river or stream to prevent water from flowing through thereby forming a reservoir

➡ a piece of fabric, usually hung from a pole, to indicate a nationality of a vessel.

➡ to be registered to a specific country(the flag state) and use their flag while sailing.

➡ State in which the vessel is recognised at international law as being registered, that is, the state under whose laws a vessel is registered, whose flag a vessel is entitled to fly .

➡ a large boat that carries people or goods across the seas or oceans

➡ a narrow passage of water that connects two larger bodies of water.