22.53°N 114.1°E / 22.53; 114.1

The Frontier Closed Area (Chinese: 邊境禁區), established by the Frontier Closed Area Order, 1951,^[1] and 1984^[2] is a regulated border zone in Hong Kong that extended inwards from the border with Mainland China.

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.

For anyone to enter the area, a Closed Area Permit is required from the Hong Kong Police Force, unless crossing the land boundary through the Frontier Closed Area with a valid travel document by land and/or sea.^[3]

The area was established under the Frontier Closed Area Order in June 1951 by Hong Kong Governor Alexander Grantham.^[4]

In order to fight gun smuggling during the Korean War, a curfew was put in place in the closed area in 1952. Villagers had to stay inside from midnight to 4:00 am unless they acquired a special permit from the police.^[5] Following the war, the curfew was retained to help control illegal immigration.^[6]

A simple chain link wire fence was built at the border between 1950 and 1953.^[7] It was later described as "flimsy" in the South China Morning Post, in that groups of refugees could press it flat simply by leaning against it.^[8]

The boundaries of the Frontier Closed Area were adjusted under the Frontier Closed Area Order, 1959, gazetted on 20 February 1959.^[9]

By 1962, thousands of undocumented migrants were attempting to enter Hong Kong each day. In response, a second, more robust fence, made of Dannert wire, was built slightly south of the original fence in May 1962.^[7][8]

Under the Frontier Closed Area (Amendment) Order 1982, gazetted on 24 June 1982, the area was expanded by four square kilometres (1.5 sq mi) in western Mai Po, near Pak Hok Chau.^[10]

The frontier area was further adjusted with the Frontier Closed Area Order 1984, gazetted on 7 September 1984. The amendments reflected the relocation of the Man Kam To Control Point, and also completely excluded Lei Uk Village from the closed area.^[11]

Border patrol duties were transferred from the British Army to the Field Patrol Detachment in October 1992.^[12]

The nighttime curfew in the Frontier Closed Area was discontinued from 1 August 1994. Secretary for Security Alistair Asprey stated this was to "balance individual rights and the need to combat illegal immigration".^[6][5]

A Closed Area Permit is a document issued by the Hong Kong Police Force to allow for people with ties or residence in the area to travel in and out of the Frontier Closed Area. Visitors to the Mai Po Marshes are also required to apply for a Mai Po Marshes Entry Permit from the Agriculture, Fisheries and Conservation Department.

• Lok Ma Chau District (includes Lok Ma Chau Checkpoint, Lok Ma Chau Spur Line Checkpoint, parts of Lok Ma Chau compensation wetland, parts of Mai Po Natural Reserves and parts of Pak Hok Chau)
• Ta Kwu Leng District (includes Lo Wu Checkpoint, small parts of Lo Wu Village, estuaries of Ng Tung River, Yuen Leng Tsai, Man Kam To Checkpoint and estuaries of Nam Hang River)^{[lower-alpha 1]}
• Sha Tau Kok District (includes Sha Tau Kok Town, Sha Tau Kok Checkpoint, parts of Shan Tsui, Yuen Tun Shan, Kong Ha Village, San Kwai Tin Village, Pak Kung Au and parts of Mo Lo Lau)^{[lower-alpha 2]}
• Chung Ying Street District
• Whole Starling Inlet

• Borders of China
• Boundaries of Hong Kong