Setail RiverThe Setail River is a river in southeastern Java, Indonesia.GeographyThe river flows in the southeastern area of Java with predominantly tropical monsoon climate. The annual average temperature in the area is 24 °C. The warmest month is October, when the average temperature is around 26 °C, and the coldest is July, at 22 °C. The average annual rainfall is 2160 mm. The wettest month is January, with an average of 475 mm rainfall, and the driest is August, with 31 mm rainfall.