The United Nations Convention on the Law of the Sea (UNCLOS), also called the Law of the Sea Convention or the Law of the Sea treaty, is the international agreement that resulted from the third United Nations Conference on the Law of the Sea (UNCLOS III), which took place from 1973 through 1982.
Offa's Dyke is a massive linear earthwork, roughly following some of the current border between England and Wales. In places, it is up to 65 feet (20 m) wide (including its flanking ditch) and 8 feet (2.5 m) high. In the 8th century it formed some kind of delineation between the Anglian kingdom of Mercia and the Welsh kingdom of Powys. It has been the subject of considerable research in recent years, dispelling many of the earlier understandings.
[[File:Schengenzone. svg|thumb|300px|Schengen Agreement The Schengen Agreement is a treaty signed in 1985, on the river-boat "Princess Marie-Astrid" anchored in Schengen, Luxembourg, between five of the ten member states of the European Community: Belgium, France, Luxembourg, the Netherlands and West Germany. The Convention implementing the Schengen Agreement supplemented it 5 years later, providing for the removal of systematic border controls between the participating countries.
The Durand Line refers to the border between Afghanistan and Pakistan, which is poorly marked and approximately 2,640 kilometers (1,610 miles) long. It was established after the 1893 Durand Line Agreement between the Government of colonial British India and Afghan Amir Abdur Rahman Khan for fixing the limit of their respective spheres of influence. It is named after Henry Mortimer Durand, the Foreign Secretary of British India at the time.
In a country that is split into two or more non-adjacent parts, with another country in between, an extraterritorial crossroad is a strip of land that formally belongs to neither country, or with other special arrangements. Often these strips of land are to be formally administered by the United Nations. Examples of extraterritorial crossroads include: Germany after World War I. The Polish corridor to the Baltic Sea separated East Prussia from the rest of Germany.
Borders define geographic boundaries of political entities or legal jurisdictions, such as governments, sovereign states, federated states and other subnational entities. Some borders—such as a state's internal administrative borders, or inter-state borders within the Schengen Area—are open and completely unguarded. Other borders are partially or fully controlled, and may be crossed legally only at designated border checkpoints.
Border controls are measures used by a country to monitor or regulate its borders. The control of the flow of many people, animals and goods across a border may be controlled by government Customs services. Security is enforced by various kinds of Border Guards and Coast Guards. Official designations, jurisdictions and subordinations of these agencies vary.
A border checkpoint is a place on the land border between two states where travellers and/or goods are inspected. Authorization is often required to enter a country through its borders. Access-controlled borders often have a limited number of checkpoints where they can be crossed without legal sanctions. International and supranational arrangements may be formed to allow or mandate less restrained crossings.
The 49th parallel north is a circle of latitude that is 49 degrees north of the Earth's equatorial plane. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean. The parallel forms part of the United States-Canadian Border from British Columbia to Manitoba on the Canadian side and from Washington to Minnesota on the U.S. side, or from the Strait of Georgia to the Lake of the Woods.
Luftflotte 2 (Air Fleet 2) was one of the primary divisions of the German Luftwaffe in World War II. It was formed February 1, 1939 in Braunschweig and transferred to Italy on November 15, 1941. The Luftflotte was disbanded on September 27, 1944.