Border barrier in the context of "Egypt–Israel barrier"

A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or serves a decorative purpose. There are various types of walls, including border barriers between countries, brick walls, defensive walls in fortifications, and retaining walls that hold back dirt, stone, water, or noise. Walls can also be found in buildings, where they support roofs, floors, and ceilings, enclose spaces, and provide shelter and security.

The construction of walls can be categorized into framed walls and mass-walls. Framed walls transfer the load to the foundation through posts, columns, or studs and typically consist of structural elements, insulation, and finish elements. Mass-walls are made of solid materials such as masonry, concrete, adobe, or rammed earth. Walls may also house utilities like electrical wiring or plumbing and must conform to local building and fire codes.

The Korean Demilitarized Zone (Korean: 한반도/조선반도 비무장 지대) is a heavily militarized strip of land running across the Korean Peninsula near the 38th parallel north. The demilitarized zone (DMZ) is a border barrier that divides the peninsula roughly in half. It was established to serve as a buffer zone between the sovereign states of the Democratic People's Republic of Korea (North Korea) and the Republic of Korea (South Korea) under the provisions of the Korean Armistice Agreement in 1953, an agreement between North Korea, China, and the United Nations Command.

The DMZ is 250 kilometers (160 mi) long and about 4 kilometers (2.5 mi) wide. There have been various incidents in and around the DMZ, with military and civilian casualties on both sides. Within the DMZ is a meeting point between the two Korean states, where negotiations take place: the small Joint Security Area (JSA) near the western end of the zone.

The Boundaries of Hong Kong, officially the Boundary of the Administrative Division of the Hong Kong Special Administrative Region of the People's Republic of China (Chinese: 中華人民共和國香港特別行政區行政區域界綫), is a regulated administrative border with border control in force under the One country, two systems constitutional principle, which separates the Hong Kong Special Administrative Region from mainland China, by land border fence of 30 km (19 mi) and maritime boundary of 733 km (455 mi), enforcing a separate immigration and customs-controlled jurisdiction from mainland China.

The boundaries of Hong Kong are patrolled and controlled by the Hong Kong Police Force and its Marine Region and the Immigration Department at land and sea. The land boundary also includes a buffer zone, known as Frontier Closed Area.

A separation barrier or separation wall is a barrier, wall or fence, constructed to limit the movement of people across a certain line or border, or to separate peoples or cultures. A separation barrier that runs along an internationally recognized border is known as a border barrier.

David Henley opines in The Guardian that separation barriers are being built at a record-rate around the world along borders and do not only surround dictatorships or pariah states. In 2014, The Washington Post listed notable 14 separation walls as of 2011, indicating that the total concurrent number of walls and barriers which separate countries and territories is 45.

The Gaza–Israel barrier (sometimes called the Iron Wall) is a border barrier located on the Israeli side of the Gaza–Israel border. Before the Gaza war, the Erez Crossing, in the north of the Gaza Strip, was the only crossing point for people and goods coming from Israel into the Gaza Strip. A second crossing point, the Kerem Shalom border crossing, is used exclusively for goods coming from Egypt as Israel did not allow goods to go directly from Egypt into Gaza through the Egypt–Gaza border, except for the Salah Al Din Gate, which opened in 2018.

A fence along the border was first constructed by Israel in 1971 as a security barrier, and has been rebuilt and upgraded since. It was constructed by Israel to control the movement of people as well as goods between the Gaza Strip and Israel, which it could not achieve by normal border crossings.

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.