query: What is the deepest river in the world?
passage: Congo River
The great Congo River (Kongo: Nzâdi Kôngo; French: Fleuve Congo; Portuguese: rio Congo), formerly known as the Zaire River under the Mobutu regime, is the second longest river in Africa, shorter only than the Nile, as well as the second largest river in the world by discharge volume, following only the Amazon. It is also the world's deepest recorded river, with measured depths in excess of 220m (720ft).[2] The Congo-Lualaba-Chambeshi River system has an overall length of 4,700km (2,920mi), which makes it the world's ninth-longest river. The Chambeshi is a tributary of the Lualaba River, and Lualaba is the name of the Congo River upstream of Boyoma Falls, extending for 1,800km (1,120mi).
passage: Kali Gandaki Gorge
The gorge separates the major peaks of Dhaulagiri (8,167m or 26,795ft) on the west and Annapurna (8,091m or 26,545ft) on the east. If one measures the depth of a canyon by the difference between the river height and the heights of the highest peaks on either side, the gorge is the world's deepest. The portion of the river directly between Dhaulagiri and Annapurna I (7km downstream from Tukuche) is at an elevation of 2,520m or 8,270ft, 5,571m or 18,278ft lower than Annapurna I.[2] As tectonic activity forced the mountains higher, the river cut down through the uplift. This region is known for shaligram fossils, revered as one of five non-living forms of Lord Vishnu.