A certain sluice is located in Matan Village, a town in the middle and lower reaches of Shima River. The catchment area above the station (sluice) site is 598km2. Shima River is a primary tributary of the Dongjiang River. It originates from Naoku Mountain in Bao'an, Shenzhen and flows through Guanlan Town, Shenzhen, Fenggang, Tangxia, Zhangmutou, Qingxi, Xiegang, Changping and Qiaotou eight towns in Dongguan. Along the way, it joins the main tributaries Yantian Water, Qiye Shishui, Qingxi Water and Guancang