Hwasong concentration camp (Chosŏn'gŭl: 화성 제16호 관리소, also spelled Hwasŏng or Hwaseong) is a labor camp in North Korea for political prisoners. The official name is Kwan-li-so (Penal-labor colony) No. 16. As with other political prison camps located in North Korea, Camp 16 is highly secretive and isolated from the rest of the country. Prisoners, usually interned for life, are subject to harsh forced labor and treatment. The estimated prisoner population size is 20,000.

Located in the mountains of Hwasong County, the camp's activities mostly consist of logging, agriculture, and some industrial production. However, the camp is also notable for its proximity to the Punggye-ri Nuclear Test Site, leading to suspicions over its connections to North Korea's development of nuclear weapons. Camp expansions in recent decades and changes in camp features indicate enhanced security measures and the need to accommodate increased prisoner populations and economic activities.

The camp is located in Hwasong County (Myonggan County), North Hamgyong Province in North Korea. It is situated along the upper reaches of the Hwasong River in a secluded mountain valley. The western border is Mantapsan, a 2,205-metre-high (7,234 ft) mountain. On the north and east sides, the camp reaches the Orangchon River valley. The entrance gate is right on the Hwasong River and on the road from Hwasong, 8 km (5.0 mi) west of Hwasong-up (Myonggan-up). The camp is not included in maps, but the entrance gate and the ring fence with watchtowers can be recognized on satellite images. A secondary entrance exists on the camp's eastern perimeter, 7 km (4.35 mi) east of the camp's primary administrative and support area at P’aeŭidŏk.

The camp is connected to North Korea's national rail network via the station at Haryegumi, 1.75km (1.09 mi) away from the main entrance. The closest air facility is the Korean People's Air Force Irhayang-dong Airfield, 13 km (8.08 mi) east of the main entrance. Two additional facilities of note include the P’unggye-ri nuclear test facility, which is 2.5 km (1.55 mi) to the west of Camp 16, and the Orangchon No. 2 Power Station 2.5 km east of the camp perimeter.

Hwasong Camp is a penal-labor colony in which detainees are imprisoned for life with no chance to be released. With around 549 km (212 sq mi) in area it is the largest prison camp in North Korea. Puhwa-ri (Chosŏn'gŭl: 부화리), 4 km (2.5 mi) north of the entrance gate, is the camp headquarters. The number of prisoners is estimated at 20,000. They are classified as "anti-revolutionary and anti-party elements" and held on charges such as opposing the succession of Kim Jong-il. Many of the prisoners are merely family members of suspected wrongdoers, who are held captive in a “guilt-by-association” punishment. It is believed that the camp was founded in the 1990s; later satellite imagery analysis of the camp dated the camp to at least 1983. Camp 16 remains operational, and is a mature and well-maintained political prison camp. Its activities are primarily focused on logging and agriculture, with smaller instances of mining, light industry, and hydroelectric power production.

Contrary to popular belief, the security perimeter of Camp 16 is not composed of a single continuous wall or fence, but instead consists of a network of security fences, patrol paths and 35 guard positions established along obvious routes of escape. Only the lower third of the camp has an actual fence, while most of the camp is patrolled by troops on foot or small vehicles, supplemented by internal roads and guard positions that may indicate distinct sections of the camp. The rugged terrain of the camp's surroundings and harsh weather conditions also likely deter escape attempts. This perimeter encompasses numerous villages within the camp area, 53 of which are named and many others unnamed, and is said to be a "total control zone" divided into three "towns" with differing levels of privileges for prisoners, depending on the severity of their crime. However, these "towns" and their zones of control are not precisely defined.

Prisoners are exploited for hard, dangerous, and deadly labor in mining, logging, and agriculture. According to Mr. Lee, a former security officer in Hwasong camp, the inmates were overworked and had very little time to rest. Prisoners had to work all day until they fulfilled their quotas and attend self-criticism meetings afterward. Often they were allowed to sleep only four hours in the night. Mr. Lee witnessed many fatal accidents in the workplace.

The North Korean nuclear tests made in 2006, 2009, 2013 and 2016 at Punggye-ri Nuclear Test Site is just 2 km (1.2 mi) to the west of the camp border. Several defectors reported that political prisoners were forced to dig tunnels and build underground facilities in areas exposed to nuclear radiation.

The existence of a 5.2 kilometre-long (3.23 mi) switchback road running from the Punggye-ri Tunnel No. 1, where underground nuclear tests are conducted, to the perimeter of Camp 16 also seems to suggest a connection between the political prison camp and North Korea's development of nuclear weapons. The road dates back to 2005, though there are no first-hand accounts of it from former guards, escapees or witnesses. Four possible explanations for the road have been put forth:

• Use for Forced Labor Transport: Camp 16 provides a readily available source of manual labor, and the sensitive nature of the nuclear program provides plausible cause for North Korea to deploy a labor force over which it exercises total control. The design of Camp 16's perimeter allows prisoners to be walked across the boundary onto the switchback road without needing permanent guard posts or gates.
• Use for Monitoring Equipment: Images show three short paths branching off from the switchback, ending in cleared platforms plotted along the conjectured layout of Tunnel No. 1, suggesting the use of monitoring equipment to measure test results.
• Use for Geologic Testing: To determine the suitability of nuclear test sites, geologic and seismic testing is required. The switchback road predates the 2006 nuclear test and its layout across the mountainside might have provided access to drilling sites associated with Tunnel No. 1.
• Use for Nuclear Test Facility Security: The lack of a complete security fence around Camp 16 requires foot patrols along the perimeter to prevent incursions into the nuclear test facility by prisoners or other unauthorized personnel. The switchback provides access to the northernmost parts of the facility, and is also the only identified path reaching the facility's eastern boundary.

Information is extremely limited, as the camp has always been a maximum security camp under strict control and surveillance. An unidentified teenager reported how he was sent to the camp with his entire family at age 13. He witnessed his father being beaten cruelly and his mother and sisters being raped by security officers. Residents from nearby villages heard about the horrific conditions inside the camp but were never allowed to get near the camp.

Security officer Lee explained the methods to execute prisoners in an interview with Amnesty International. He witnessed prisoners forced to dig their own graves and being killed with hammer blows to their necks. He also witnessed prison officers strangling detainees and then beating them to death with wooden sticks. According to him, several women were raped by the officials and executed secretly thereafter.

Apart from the use of forced labor under poor conditions, there are also concerns over prisoners' health as a result of the camp's proximity to the Punggye-ri nuclear test facility. They are at risk from accidental radiation leaks, as is suspected to have occurred during the 2006 and 2013 nuclear tests.

Analysis of satellite images by Amnesty International in October 2013 shows that the prisoner population of Hwasong camp has slightly increased compared to 2008. In several prisoner villages, new housing structures and new administrative buildings can be identified. Some of the new prisoners may have been relocated from Hoeryong concentration camp to Hwasong. More construction since then has been identified in a 2015 image analysis report by HRNK, which pointed out the emergence of new housing and support buildings in the camp's various villages, suggesting a further significant increase in the prisoner population.

The camp's security perimeter has also changed over time. Sections of the western perimeter moved east during 2010-2015, supported by double and triple-walled guard positions, while the extreme northwest section expanded during 2006–2009 to develop logging operations. Meanwhile, segments of the eastern perimeter shifted west since 2010 to support logging and economic development along the Orangchon River.

• Besides an unidentified teenager, no former prisoner was found to provide direct testimony, for fear of retribution.
• Mr. Lee (full name withheld for his safety; served between 1980s - mid-1990s in Hwasong) was a security officer in the camp.

• Human rights in North Korea
• Prisons in North Korea
• Yodok concentration camp
• Kaechon internment camp

• "The Hidden Gulag" (PDF). Committee for Human Rights in North Korea. Archived from the original (PDF) on 2015-03-13. Retrieved 2012-09-14. – Overview of North Korean prison camps with testimonies and satellite photographs.
• "Political Prison Camps in North Korea Today" (PDF). Database Center for North Korean Human Rights. Archived from the original (PDF) on 2013-10-19. – Comprehensive analysis of various aspects of life in political prison camps.
• "North Korea: New satellite images show continued investment in the infrastructure of repression". Amnesty International. – Analysis of satellite images of Hwasong camp and Yodok camp.
• "North Korea: New satellite images show scale of forced labour in prison camps". Amnesty International UK. – Video with testimonies about Hwasong camp and Yodok camp.
• One Free Korea – Camp 16 and Mt. Mantap Nuclear Test Site (satellite images with explanations).
• The Daily NK: The Hub of North Korean News – News about North Korea and human rights.

41°16′07″N 129°23′28″E / 41.268505°N 129.391211°E / 41.268505; 129.391211