The Inaba family, which was trusted by Tokugawa, set up a camp as a strategic point on the waterway where the three rivers of Katsura-gawa River (Yodo-gawa River system), Yodo-gawa River and Kizu-gawa River (Kyoto Prefecture) met.
桂川(淀川水系)・淀川・木津川(京都府)の三川が合流する水路の要所として、徳川の信任厚い稲葉家が陣取った。