Khash is a city in the Central District of Khash County, Sistan and Baluchestan province, Iran, serving as capital of both the county and …Khash is a city in the Central District of Khash County, Sistan and Baluchestan province, Iran, serving as capital of both the county and the district. Today's Khash is located near the old city of Khash, which dates back to the reign of Nader Shah. During the Sasanian era, an area called Washt was mentioned in modern Baluchistan in the area of Khash, which shows that the history of this city goes back to the ancient times and the old city of Khash dates back to the pre-Islamic era.