Abadan is a city and capital of Abadan County, Khuzestan Province, which is located in the southwest of Iran. It lies on Abadan Island. The island is bounded in the west by the Arvand waterway.

The climate in Abadan is arid and summers are dry and extremely hot, with temperatures above 45 °C (113 °F) almost daily and temperatures above 50 °C (122 °F) can be almost common. Abadan is notably one of the few hottest populated places on earth.

Restrictions on freshwater resources as well as population growth in Abadan in recent years have increased the city's water needs.

For this purpose, SazehSazan company has tried its best to overcome this limitation as much as possible, by constructing the desalination complex and also operating the facilities of the Khorramshahr water treatment plant, in cooperation with the Khuzestan Water and Sewerage Company.

Khorramshahr is a city and capital of Khorramshahr County, Khuzestan Province, Iran. Khorramshahr is an inland port city located approximately 10 kilometres (6.2 mi) north of Abadan. The city extends to the right bank of the Shatt Al Arab waterway near its confluence with the Haffar arm of the Karun river.

In Khorramshahr, the summers are long, sweltering, arid, and clear and the winters are cool, dry, and mostly clear. Over the course of the year, the temperature typically varies from 45°F to 115°F and is rarely below 37°F or above 120°F.

Restrictions on freshwater resources as well as population growth in Khorramshahr in recent years have increased the city's water needs. To increase the drinking water quality in the region, the Desalination Complex of SazehSazan was established and put into operation.