What is Harbor?

Legal Definition
A harbor or harbour (see spelling differences), or haven, is a body of water where ships, boats and barges seek shelter from stormy weather, or are stored for future use. Harbors and ports are often confused with each other. A port is a manmade facility built for loading and unloading vessels and dropping off and picking up passengers. Ports are often located in harbors.

Harbors can be natural or artificial. An artificial harbor can have deliberately constructed breakwaters, sea walls, or jettys, or they can be constructed by dredging, which requires maintenance by further periodic dredging. An example of an artificial harbor is Long Beach Harbor, California, United States which was an array of salt marshes and tidal flats too shallow for modern merchant ships before it was first dredged in the early 20th century.

In contrast, a natural harbor is surrounded on several sides by prominences of land. Examples of natural harbors include Sydney Harbour, Australia and Trincomalee Harbour in Sri Lanka.
-- Wikipedia
Legal Definition
A place where ships may ride with safety; any navigable water protected by the surrounding country; a haven. (q. v.) It is public property. 1. Bouv. Inst. n. 435.
-- Bouviers Law Dictionary
Legal Definition
Torts. To receive clandestinely or without lawful authority a person for the purpose of so concealing him that another having a right to the lawful custody of such person, shall be deprived of the same; for example, the harboring of a wife or an apprentice, in order to deprive the husband or the master of them; or in a less technical sense, it is the reception of persons improperly. 10 N. H. Rep. 247; 4 Scam. 498.

2. The harboring of such persons will subject the barborer to an, action for the injury; but in order to put him completely in the wrong, a demand should be made for their restoration, for in cases where the harborer has not committed any other wrong than merely receiving the plaintiff's wife, child, or apprentice, he may be under no obligation to return them without a demand. 1 Chit. Pr. 564; Dane's Ab. Index, h. t.; 2 N. Car. Law Repos.249; 5 How. U. S. Rep. 215, 227.
-- Bouviers Law Dictionary
Legal Definition
v. To receive clandestinely and without lawful authority a person for the purpose of so concealing him that another having a right to the lawful custody of such person shall be deprived of the same. Jones v. Van Zandt, 5 How. 215, 227, 12 L. Ed. 122. A distinction has been taken, in some decisions, between "harbor" and "conceal." A person may be convicted of harboring a slave, although he may not have concealed her. McElhaney v. State, 24 Ala. 7L
-- Black's Law Dictionary
Legal Definition
n. A haven or a space of deep water so sheltered by the adjacent land as to afford a safe anchorage for ships. Rowe v. Smith, 51 Conn. 271, 50 Am. Rep. 16; The Aurania (D. C.) 29 Fed. 103 ; People v. Klrsch, 67 Mich. 539, 35 N. W. 157. "Port" is a word of larger import than "harbor," since it implies the presence of wharves, or at any rate the means and opportunity of receiving and discharging cargo.
See also
-- Black's Law Dictionary
Legal Definition
A bay forming sheltered mooring for ships. See 51 Conn. 266, 50 Am. Rep. 16. See, also, Harboring.
-- Ballentine's Law Dictionary