Golestan province is one of the 31 provinces of Iran, located in the northeast of the country and southeast of the Caspian Sea. Its capital is Gorgan, formerly called Esterabad until 1937. Golestan was split off from Mazandaran province in 1997.

Gorgan is a city in the Central District of Gorgan County, Golestan province, Iran, serving as capital of the province, the county, and the district. It lies approximately 400 km (250 mi) to the northeast of the national capital Tehran, and some 30 km (19 mi) away from the Caspian Sea.