The Macau Peninsula has a gate built on the northern isthmus, for how long did it serve as a border?
Macau Peninsula Macau Peninsula is the most populous and historic part of Macau. It has an area of 8.5 km² (4 x ) and is geographically connected to Guangdong province, at the northeast, through an isthmus 200 m wide. The peninsula, together with the city centre of Zhuhai, sits on an island separated from the continent by distributaries of the Pearl River. The Border Gate (; Portuguese: "Portas do Cerco" ) was built on the northern isthmus. At the south, the peninsula is connected to Taipa Island by three bridges, the Friendship Bridge ("Ponte de Amizade"); the Macau-Taipa Bridge ("Ponte Governador Nobre de Carvalho"); and the Sai Van Bridge ("Ponte de Sai Van"). The longest axis extends 4 km from the Border Gate to the southwestern edge, Barra (媽閣嘴). There is a western Inner Harbour (內港), and an eastern Outer Harbour (外港). The 93 m Guia Hill (松山) is the highest point on the peninsula, which is, on an average, 50 to . Many coastal places are reclaimed from sea. The Historic Centre of Macau, which is entirely in the Macau Peninsula, became a World Heritage Site in 2005.
Great Clearance The Great Clearance, also translated as the Great Evacuation or Great Frontier Shift, refers to two edicts by the Kangxi Emperor of Qing (1644–1912), and his regent Oboi, in 1661 and 1662. It required the evacuation of the coastal areas of Guangdong in order to fight the Taiwan-based anti-Qing loyalist movement of the erstwhile Ming dynasty (1368–1644). Other provinces in southern China, including Zhejiang, Jiangsu and Fujian, as well as Shandong in the north, were also affected to varying degrees. The ban on human settlement of those coastal areas was lifted in 1669, and some residents were allowed to return.