Water may be scarce in the tablelands, but the plains at the foot of the mountains sit on a fault line, and as such have plentiful underground water supplies. This attracted a number of Pingpu Aboriginal tribes to the area.
此外，雖然大肚台地水源短缺，但山腳平原因處於斷層帶上，地下水脈豐沛，吸引了許多平埔族聚落在此生活。