What is Territorial Jurisdiction?

Legal Definition
Territorial jurisdiction in United States law refers to a court's power over events and persons within the bounds of a particular geographic territory. If a court does not have territorial jurisdiction over the events or persons within it, then the court cannot bind the defendant to an obligation or adjudicate any rights involving them. Territorial jurisdiction is to be distinguished from subject-matter jurisdiction, which is the power of a court to render a judgment concerning a certain subject matter, or personal jurisdiction, which is the power of a court to render a judgment concerning particular persons, wherever they may be. Personal jurisdiction, territorial jurisdiction, subject-matter jurisdiction, and proper notice to the defendant are prerequisites for a valid judgment.
-- Wikipedia
Legal Definition
Territorial jurisdiction is the court's power to bind the parties to the action. This law determines the scope of federal and state court power. State court territorial jurisdiction is determined by the Due Process Clause of the Constitution's Fourteenth Amendment and the federal court territorial jurisdiction is determined by the Due Process Clause of the Constitution's Fifth Amendment. Furthermore, Rule 4 of the Federal Rules of Civil Procedure (and its amendments) clarifies how the question of territorial jurisdiction should be answered in Federal Court. Case law decisions relevant to questions of territorial jurisdiction include Ahrens v. Clark, 335 U.S. 188, EEOC v. Arabian American Oil Co., 499 U.S. 244, 248 (1991), and Rasul v. Bush, 542 U.S. 466 (2004).

See jurisdiction.
Legal Definition
Jurisdiction considered as limited to cases arising or persons residing within a defined territory, as, a county, a judicial district, etc. The authority of any court is limited by the boundaries thus fixed. See Phillips v. Thralls, 26 Kan. 781.
-- Black's Law Dictionary
Legal Definition
The space or district within which judicial or other authority may be lawfully exercised. See 26 Kan. 780.
-- Ballentine's Law Dictionary
Legal Definition
a term used for an area that a government has authority over.