A more thorough explanation:

Definition: The waters under a state's or nation's jurisdiction, including both inland waters and surrounding sea (traditionally within three miles of the coastline).

Example: The United States claims a maritime belt of three nautical miles from its coastline, which means that it has exclusive rights to explore, exploit, and manage the natural resources in that area, such as fish, oil, and gas.

Explanation: The example illustrates how a maritime belt is a zone of water that is subject to the sovereignty of a coastal state or nation. The extent of the maritime belt may vary depending on the legal framework and the geographical features of the coastline. The purpose of claiming a maritime belt is to protect the national interests and security of the coastal state, as well as to regulate the activities of foreign vessels and entities in the area. The concept of a maritime belt is important in international law, as it affects the rights and obligations of states in relation to the use and management of the oceans and their resources.