quality:correction, information:highlighting
Geography

The old town of Guangzhou was near Baiyun Mountain on the east bank of the Pearl River (Zhujiang) about 80 mi (129 km) from its junction with the South China Sea and about 300 mi (483 km) below its head of navigation. It commanded the rich alluvial plain of the Pearl River Delta, with its connection to the sea protected at the Humen Strait. The present city spans 7,434.4 km (2,870.4 sq mi) on both sides of the river from 112° 57′ to 114° 03′ E longitude and 22° 26′ to 23° 56′ N latitude in south-central Guangdong. The Pearl is the 4th-largest river of China. Intertidal ecosystems exist on the tidal flat lining the river estuary, however, many of the tidal flats have been reclaimed for agriculture. Baiyun Mountain is now locally referred to as the city's "lung" (市 肺).

The elevation of the prefecture generally increases from southwest to northeast, with mountains forming the backbone of the city and the ocean comprising the front. Tiantang Peak is the highest point of elevation at 1,210 m (3,970 ft) above sea level.