濁水溪
Jiji is bordered by Jhongliao to the north, Mingjian to the west, Jhushan and Lugu to the south, and Shuili to the east. The Zhuoshui River flows westward along the south border of the township. Jiji Township has a total area of 49.72 square kilometers. The lowest point in the township is 230 m above sea level and its highest point is Big Jiji Mountain (集集大山) at 1392 m above sea level. The township is rather mountainous and is surrounded by mountains on all sides.