23 km from Surabaya, the regional government of Sidoarjo regency was born on January 31,1859. It is from 112.5 ? and 112.9 ? east longitude to 7.3 ? and 7.5? degrees south latitude. The regency is bordered on the north by Surabaya municipality and Gresik regency, on the south by Pasuruan regency, or the west by Mojokerto regency and on the east by the straits of Madura. The minimum temperature is 20o C, and the maximum one is 35o C. Elevation :
0 - 3 meters above sea level: coastal regions/ fish ponds covering 29.9 % of the total area (most have salty water).
0 - 10 meters above sea level: central regions located along the main roads covering 40.81 % of the total area (all have fresh water).
0 - 25 meters above sea level: western regions covering 29.20 % of the total areas.
As the smallest regency in East Java, Sidoarjo occupies an area of land of + 63,489.534 Ha. Or 634.89 sq. km, it is located between the Surabaya river ( + 32.5 km long) and the Porong river (47 km long) the land use is classified into the followings: Rice fields: 28,763 Ha, Sugar cane plantation: 8,000 Ha, Fishpond: 15,729 Ha The rest are for the purposes of dry field industry and so on.