What is "roshtkhar"

Roshtkhar (; also Romanized as Rashtkhvār, Roshtkhvār, Roshtehkhvār, and Roshtkhār; also known as Rash Khar, Rashkhvān, Roshkhvār, and Rūshkār) is a city in and the capital of Roshtkhar County, in Razavi Khorasan Province, Iran. At the 2006 census, its population was 5,123, in 1,278 families.