Mud is a city in, and the capital of, Mud District of Sarbisheh County, South Khorasan province, Iran. It also serves as the administrative center fo…Mud is a city in, and the capital of, Mud District of Sarbisheh County, South Khorasan province, Iran. It also serves as the administrative center for Mud Rural District. Archaeologists excavating in the southern historical town of Moud in South Khorasan province have unearthed ancient earthenware dating back to the Parthian dynastic era. Excavations were conducted on an ancient mound located near the city of Birjand. Numerous historical artifacts dating back from the pre-historic eras up to the Safavid dynasty were found at the site.