Suminoe-ku is one of 24 wards of Osaka, Japan, stretching along the south-west border of the city. It borders the wards of Minato-ku, Taisho-ku and Nishinari-ku to the north, and Sumiyoshi-ku to the east. It is the largest land area of all wards in Osaka, and includes about half of the Osaka Bay harbor area. Suminoe-ku is connected to the region by three municipal subway lines, as well as two rail lines and three expressways.