A penal colony was a settlement a government built in a remote territory to hold people convicted of crimes, where they served their sentences through forced labor rather than ordinary imprisonment. From the early 1700s into the mid-twentieth century, Britain, France, Russia, Portugal, and other powers ran these settlements on islands and frontier territories across the world, using convict labor to clear land, build infrastructure, and populate holdings their empires wanted to secure.
How a Penal Colony Differed From a Prison
A prison confines someone inside a building. A penal colony moved them to the other side of the world and put them to work there.
The legal sentence that sent a person to a penal colony was called transportation, and it was not the same as banishment. Banishment simply forbade a person from returning home before their sentence expired; where they went in the meantime was their problem. Transportation involved physical delivery to a specific territory, followed by the loss of liberty after arrival. The convict did not choose the destination, and did not go free once they got there.
Governments chose penal colony locations with three things in mind: remoteness that made escape nearly impossible, natural resources the convicts could extract, and strategic value in populating territory that rival empires might otherwise take. Islands were especially useful because the ocean itself served as a wall.
How Penal Colonies Functioned Day to Day
Compulsory labor was the point. Convicts cleared forests, broke rock in quarries, built roads and government buildings, farmed, and worked in mines. The work was unpaid or nearly so, and it served two purposes at once: punishing the convict and developing the colony’s economy. The home government got infrastructure and resource extraction at almost no labor cost.
Most colonies were supposed to be self-sufficient. Convicts grew food, built their own barracks, and manufactured basic supplies. In practice, disease, poor soil, and administrative failure meant many settlements leaned on supply ships for years. Living conditions were consistently terrible: overcrowded quarters, bad sanitation, rotten or insufficient food, and almost no medical care. Discipline was enforced through flogging, solitary confinement, reduced rations, and execution.
Harshness was partly intentional. Governments wanted word to filter back home that transportation was something to fear. The deterrent depended on the reputation.
Britain’s Transportation to the American Colonies
Britain formalized the practice with the Transportation Act of 1718, which let courts sentence serious offenders to at least seven years of labor in the American colonies. Returning early carried the death penalty. Before 1718, judges had been shipping convicts overseas on an ad hoc basis; the act made transportation a routine sentencing option.
Estimates of how many convicts Britain sent to America between 1718 and 1775 range from 50,000 to over 100,000. Record-keeping was inconsistent and private contractors handled many of the shipments without clear logs. The American Revolution ended the arrangement abruptly. The newly independent United States refused further convicts, and Britain had to find somewhere else to send them.
Australia’s Penal Settlements
That somewhere was Australia. The First Fleet of eleven ships carrying 736 convicts sailed in May 1787 and reached Botany Bay in January 1788. The settlement that became Sydney was chosen for its deep harbor and fresh water. Over the next eighty years, more than 160,000 convicts were transported to various Australian settlements, including Norfolk Island and Van Diemen’s Land, now Tasmania.
Norfolk Island became the most feared destination in the British system. It was reserved for repeat offenders and for convicts who committed further crimes after arriving in Australia. The labor was grueling, the punishments extreme, and the island sat roughly a thousand miles east of the Australian mainland.
Not every convict’s story ended badly. Australia’s system included the ticket of leave, introduced in 1801, which allowed convicts who demonstrated good behavior to work for themselves within a designated district. A ticket holder could seek employment, own property, and live semi-independently, though they had to report to local authorities regularly. Under rules formalized in 1827, a convict sentenced to seven years could qualify after serving four; a lifer had to serve at least eight. The ticket could be revoked for misconduct, and the holder did not become truly free until pardoned or until the original sentence expired.1Museums of History NSW. Convict Tickets of Leave
Former convicts, known as emancipists, sometimes went on to become farmers, business owners, and even magistrates, and some received land grants. Roughly 25,000 of the convicts transported to Australia were women. In a settlement that needed population growth, women were valued as wives and mothers, and many ran taverns, inns, and small farms, work that would have been largely unavailable to women of their class in Britain. For some convicted of petty theft or fraud, transportation offered more economic opportunity than the life they left behind.
Transportation to New South Wales ended around 1840. Van Diemen’s Land followed in 1853. The last convict ship, the Hougoumont, reached Western Australia on January 10, 1868, exactly eighty years after the First Fleet landed.
France’s Devil’s Island
France ran its own penal colony system in French Guiana, on the northeastern coast of South America. Emperor Napoleon III opened it in 1852, and it eventually took in several mainland facilities and a cluster of offshore islands known as the Îles du Salut. The most infamous was Île du Diable, Devil’s Island, which held political prisoners. Captain Alfred Dreyfus, wrongly convicted of treason in 1894, was held there for years before being exonerated. Henri Charrière, better known as Papillon, later wrote a bestselling and heavily embellished memoir about his time in the colony.
Conditions were staggering in their lethality. Estimates of total convicts sent range from 80,000 to over 90,000, and tropical disease, starvation, and deliberate brutality killed the majority. Survivors were originally forbidden from returning to France and had to remain in the colony as nominally free settlers. When repatriation was eventually permitted, fewer than 2,000 returned alive. France stopped sending prisoners in 1938, and the colony closed permanently in 1953.
Russia’s Katorga and the Soviet Gulag
Russia had been using Siberia as a dumping ground for criminals and political dissidents for centuries, but the system became more organized in the 1800s. In 1869, Tsar Alexander II formally established katorga, or hard penal labor, on the island of Sakhalin off Russia’s Pacific coast. More than 30,000 criminals and political prisoners eventually served sentences there, mining coal, logging, and building infrastructure for Russia’s Pacific fleet.2Presidential Library (Russia). Katorga Labour Introduced in Sakhalin
The Soviet Union inherited and vastly expanded this tradition. The Gulag, an acronym for the Main Administration of Camps, operated from roughly 1929 to 1953 and dwarfed every other penal system in history. An estimated 18 million people passed through its network of camps across Siberia, Central Asia, and the Arctic. Prisoners mined gold, cut timber, built railways and canals, and worked in factories.
Death estimates for the Gulag range from 1.6 million to as many as 15 million, depending on the source. The uncertainty is itself part of the record: Soviet record-keeping was deliberately opaque, and many deaths were attributed to causes that obscured the camps’ role. What is not disputed is that the Gulag functioned as both an instrument of political repression and an economic engine for some of the Soviet Union’s largest industrial projects.
Other Notable Examples
Portugal operated penal colonies in Angola and Mozambique beginning in earnest in the 1880s. The main institution was the Depósito de Degredados in Luanda, which functioned from roughly 1866 to 1932. Portugal’s motives were explicit: exile paired with forced labor, assertion of “effective occupation” of African territories that rival European powers might claim under the Treaty of Berlin, and a cheap labor supply during the transition away from slavery.
The United States established the Iwahig Penal Colony on the island of Palawan in the Philippines in 1904, during the American colonial administration. It originally covered more than 28,000 hectares, later expanded to roughly 41,000, and sat on the remote western edge of the archipelago, far from population centers.3Bureau of Corrections (Philippines). The American Commonwealth Government
The United States never established overseas penal colonies in the traditional sense, but in the decades after the Civil War, Southern states created a system that functioned similarly. Under convict leasing, state and local governments rented prisoners to private companies for labor in mines, plantations, and railroad construction. The legal basis was the Thirteenth Amendment itself, which abolished slavery “except as a punishment for crime whereof the party shall have been duly convicted.”4Library of Congress. US Constitution – Thirteenth Amendment The system was overwhelmingly applied to Black prisoners, many convicted under vaguely written vagrancy laws designed to criminalize formerly enslaved people. Alabama became the last state to abolish convict leasing in 1928.
Why Penal Colonies Disappeared
The decline came for overlapping reasons, and the timeline varied by country. In Australia, free settlers organized anti-transportation demonstrations, humanitarian sentiment in Britain grew, and the colonies matured past needing convict labor. A parliamentary inquiry chaired by William Molesworth issued a report in 1838 recommending abolition, drawing uncomfortable parallels between the treatment of convicts and slaves. In French Guiana, international embarrassment and the colony’s death rate eventually made the system politically indefensible.
International law closed off part of the ground as well. The International Labour Organization adopted the Forced Labour Convention in 1930, which required member nations to suppress forced labor “in all its forms within the shortest possible period.” The convention carved out an exception for labor imposed by a court conviction, but only when performed under government supervision and not for the benefit of private individuals or companies.5International Labour Organization. ILO Forced Labour Convention, 1930 (No. 29) That exception left room for ordinary prison labor, but the large-scale transportation of convicts to remote colonies, where they built private fortunes for colonial enterprises, became increasingly difficult to justify. The last major penal colony, the French system in Guiana, closed in 1953.
What Still Looks Like a Penal Colony
Formal penal colonies are gone, but the underlying logic of isolating prisoners in remote locations and extracting their labor has not entirely disappeared. North Korea operates a network of forced-labor camps in remote mountain valleys where political prisoners and convicted criminals work in mining, logging, and farming. The scale is difficult to verify because North Korea permits no outside access, but estimates suggest tens of thousands of people are held in these facilities at any given time.
In the United States, the Thirteenth Amendment’s exception clause means that incarcerated people can be compelled to work, and most are paid far below minimum wage when they are paid at all. The comparison to historical penal colonies is imperfect. American prisoners are not transported overseas, and conditions, while often poor, are subject to constitutional constraints that penal colony inmates never had. The economic structure, though, is recognizable: a captive labor force performing work that benefits the government or private contractors, with little bargaining power and few alternatives.
Every major penal colony system began with a stated goal of deterrence or reform and ended as a labor scheme. That pattern has proved durable, even after the colonies themselves were shut down.