The origin of Sanhekou in Macheng City?

Sanhekou Town is located in the northeast of Macheng City, at the junction of the three provinces of Hubei, Henan and Anhui, and is known as the "Three Cock-Crowing Provinces". It is named because the town government is located at the confluence of three rivers: Zhangguang River, Shimen River and Shiqiaopu River in the northeast. It borders Jinzhai County of Anhui Province and Muzidian Town of this city to the east, Guishan Town and Yanjiahe Town of this city to the south, Huangtugang Town of this city to the west, and Shangcheng County of Henan Province to the north. The territory covers an area of ??380.38 square kilometers, ranking first in Huanggang City. The territory also has a large reservoir - Sanhe Reservoir and a medium-sized reservoir - Green River Reservoir.