A harbor is a geographic location with a body of water of sufficient depth for vessels to enter to seek rest, obtain supplies, and find shelter from storms or other natural phenomena. Harbors typically are naturally occurring but may be constructed. The modern harbor is a place where vessels are built, launched, anchored, and repaired, and usually contains terminals for incoming and outgoing vessels to transport cargo and people. Harbors typically are used for commercial, naval, and fishery vessels, as well as refuge for small craft. Most harbors that accommodate large vessels are situated at the mouth of a river or at some point where it is easy to transfer cargoes inland by river barges, railroads, or trucks.