Border zone in the context of "Border Security Zone of Russia"

A buffer zone, also historically known as a march, is a neutral area that lies between two or more bodies of land; usually, between countries. Depending on the type of buffer zone, it may serve to separate regions or conjoin them.Common types of buffer zones are demilitarized zones, border zones and certain restrictive easement zones and green belts. Such zones may be comprised by a sovereign state, forming a buffer state.

Buffer zones have various purposes, politically or otherwise. They can be set up for a multitude of reasons, such as to prevent violence, protect the environment, shield residential and commercial zones from industrial accidents or natural disasters, or even isolate prisons. Buffer zones often result in large uninhabited regions that are themselves noteworthy in many increasingly developed or crowded parts of the world that unintentionally create a de facto wildlife sanctuary.

The international border between Finland and Russia is 1,340 km (830 mi) long and runs approximately north to south, mostly through taiga forests and sparsely populated rural areas. It does not follow any natural landmarks, such as mountains or rivers. It is also an external border of the European Union and NATO.

It is patrolled by the Finnish Border Guard and the Border Guard Service of Russia, who also enforce border zones extending, respectively, up to 3 km (1.9 mi) on the Finnish side and at least 7.5 km (4.7 mi) on the Russian side. A permit is required for entry to these border zones. Electronic surveillance on the Finnish side is concentrated most heavily on the southernmost 200 kilometers (125 miles). In addition, the Finnish Border Guard conducts irregularly scheduled dog patrols multiple times daily to catch illegal entries into the border zone. In the Arctic region, Russia maintains its 500-year-old border patrol, with plans to upgrade Soviet-era technologies to reduce costs and improve efficiency by 2020.

The Frontier Closed Area (Chinese: 邊境禁區) is a regulated border zone in Hong Kong that extends inwards from the border with mainland China. It was established by the Frontier Closed Area Order, 1951, and 1984.

Established to prevent illegal migrants and other illegal activities from mainland China and elsewhere by land and sea, the closed area is fenced along its perimeter to serve as a buffer between the closed border and the rest of the territory patrolled and controlled by Hong Kong Police Force and its Marine Region and the Immigration Department at land and sea. Developments are tightly controlled within the area, leading to less construction and causing most of the area to become a natural habitat for animals and plants.