About 500 meters. According to different river basins, the width of the Pearl River has also changed, and the widest point is about 500 meters (estuary). It&;s wider than the Huangpu River in Shanghai. The Pearl River, also known as the Yuejiang River, is the second largest river and the third longest river in China. The Pearl River originally refers to a 96-kilometer-long waterway from Guangzhou to the estuary. It got its name because it flows through the famous Haizhu Island (Stone), and later it gradually became the general name of the Xijiang River, Dongjiang River, Beijiang River and the rivers in the Pearl River Delta. The Pearl River originates from Maxiong Mountain, Wumeng Mountain in Yunnan-Guizhou Plateau, flows through six provinces in the central and western regions and northern Vietnam, and flows into the South China Sea from eight estuaries in the downstream.