San Francisco riverlength of 2900 kilometers, flowing through the arid northeast, is the region's main source of water for irrigation.
圣弗朗西斯科河系全长2900公里，流经干旱的东北部，是该地区主要的灌溉水源。
2
The three streams had similar latitude, riverlength and watershed area. All were the tributaries of the Yangtse River and located in the upstream areas.