A Hakka walled village () is a large multi-family communal living structure that is designed to be easily defensible. This building style is unique to the Hakka people found in southern China. Walled villages are typically designed for defensive purposes and consist of one entrance and no windows at the ground level. History The Hakka were originally immigrants from northern China who settled in the southern provinces. From the 17th century onwards, population pressures drove them more and more into conflict with their neighbours (called punti in Cantonese). As rivalry for resources turned to armed warfare, the Hakka began building communal living structures designed to be easily defensible. These houses, sometimes called tulou 土楼, were often round in shape and internally divided into many compartments for food storage, living quarters, ancestral temple, armoury etc. The largest houses covered over and it is not unusual to find surviving houses of over . Features Hakka walled villages can be constructed from brick, stone, or rammed earth, with the last being the most common. The external wall is typically in thickness and the entire building could be up to three or four stories in height. Often turrets were also built to extend the range of defensive power and to cover otherwise indefensible points. Battlements were also constructed on the top floor for muskets. The gate was the most vulnerable point and it was usually reinforced with stone and covered with iron. A number of smaller gates followed, in case the outer one was breached. With the exception of a few exceptionally large forts, Hakka houses usually only had one entrance. The round shape of the walls, which became popular in later stages, added to the defensive value of the fortifications and reduced the firepower of artillery against it. A Hakka fort could withstand a protracted siege, since it was well stocked with grains and had an internal source of water. They often also had their own sophisticated sewage systems. The architectural style of Hakka forts is unique in China and around the world. The typical Chinese house contains a courtyard and, other than pagodas, does not often contain any structures higher than two stories. Researchers note similarity between some of the walled villages and some ancient fortifications in southern China, as seen in Han Dynasty and Three Kingdoms tomb models unearthed in Guangzhou, Guangdong and in Ezhou, Hubei. Tulou The Hakkas who settled