The Immigration Depot (आप्रवासी घाट, ISO: Āpravāsī Ghāta) is a building complex located in Port Louis on the Indian Ocean island of Mauritius, the first British colony to receive indentured, or contracted, labour workforce from many countries. From 1849 to 1923, half a million Indian indentured labourers passed through the Immigration Depot, to be transported to plantations throughout the British Empire. The large-scale migration of the labourers left an indelible mark on the societies of many former British colonies, with Indians constituting a substantial proportion of their national populations. In Mauritius alone, 68 percent of the current total population is of Indian ancestry. The Immigration Depot has thus become an important reference point in the history and cultural identity of Mauritius. Unchecked infrastructural development in the mid-20th century means that only the partial remains of three stone buildings from the entire complex have survived. These are now protected as a national monument, under the Mauritian national heritage legislation. The Immigration Depot's role in social history was recognized by UNESCO when it was declared a World Heritage Site in 2006. The site is under the management of the Aapravasi Ghat Trust Fund. Conservation efforts are underway to restore the fragile buildings back to their 1860s state. It is one of two World Heritage Sites in Mauritius, along with Le Morne Brabant. The word ghat is explained by numerous Dravidian etymons such as Kannada gatta (mountain range) Tamil kattu (side of a mountain, dam, ridge, causeway) and Telugu katta and gattu (dam, embankment). Ghat, a term used in the Indian subcontinent, depending on the context could either refer to a range of stepped-hill such as Eastern Ghats and Western Ghats; or the series of steps leading down to a body of water or wharf, such bathing or cremation place along the banks of a river or pond, Ghats in Varanasi, Dhoby Ghaut or Aapravasi Ghat. Roads passing through ghats are called Ghat Roads.