Macau Peninsula is the oldest and most populous part of the former Portuguese territory of Macau, now a special administrative region of the People’s Republic of China. It has an area of 8.5 km (4 x 1.8) and is geographically connected to Zhuhai, Mainland China, at the northeast, through an isthmus 200-metre 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 (traditional Chinese: ;Portuguese: Portas do Cerco) was built on the northern isthmus. At the south, the peninsula is connected to Taipa Island by three bridges. The longest axis (4-kilometre) extends from the Border Gate to the southwestern edge, Barra .There is a western Inner Harbour,and an eastern Outer Habour. The 93-metre Guia Hill is the highest point on the peninsula, which is, on an average, 50 to 75 metres. Many coastal places are reclaimed from sea.