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.
Johor Sultanate The Sultanate of Johor (or sometimes Johor-Riau or Johor-Riau-Lingga or Johor Empire) was founded by Malaccan Sultan Mahmud Shah's son, Sultan Alauddin Riayat Shah II in 1528. Johor was part of the Malaccan Sultanate before the Portuguese conquered Malacca's capital in 1511. At its height, the sultanate controlled modern-day Johor, Riau, and territories stretching from the river Klang to the Linggi and Tanjung Tuan, Muar, Batu Pahat, Singapore, Pulau Tinggi and other islands off the east coast of the Malay peninsula, the Karimun islands, the islands of Bintan, Bulang, Lingga and Bunguran, and Bengkalis, Kampar and Siak in Sumatra. During the colonial era, the mainland part was administered by the British, and the insular part by the Dutch, thus breaking up the sultanate into Johor and Riau. In 1946, the British section became part of the Malayan Union. Two years later, it joined the Federation of Malaya and subsequently, the Federation of Malaysia in 1963. In 1949, the Dutch section became part of Indonesia.