Mashhad is the second most populous city in Iran and is the capital of Razavi Khorasan Province. It is located in the north east of the country close to the borders of Afghanistan and Turkmenistan. Its population is 3,131,586. It was a major oasis along the ancient Silk Road connecting with Merv in the East.
Mashhad is also known as the city of Ferdowsi, the Iranian poet of Shahnameh, which is considered to be the national epic of Iran. The city is also well-known and respected for housing the tomb of Imam Reza, the eighth Shia Imam.
Sources: Tasnim News, Wikipedia | Mashhad