Mazr-e Sharf or Mazri Sharf Pharsee, is the fourth largest city of Afghanistan, with population of 300,600 people (2006 estimate). It is the capital of Balkh province and is linked by roads to Kabul in the south-east, Herat to the west and Uzbekistan to the north. Mazari Sharif means "Noble Shrine," a reference to the large, blue-tiled sanctuary and mosque in the center of the city known as the Shrine of Hazrat Ali or the Blue Mosque. It is believed by some Muslims that the site of the tomb of Ali ibn Abi Talib, the cousin and son-in-law of Prophet Muhammad, is in Mazari Sharif. Twelver Shi'as however, believe that the real grave of Ali is found within Imam Ali Mosque in Najaf, Iraq, as was disclosed by the Sixth Twelver Shi'a Imam, Ja'far as-Sadiq. The city is a major tourist attraction because of its fabulous Muslim and Hellenistic archeological sites. In July 2006, the discovery of new Hellenistic remains was announced. The ethnic majority in the city are Tajiks.