Herāt (Persian / Pashto: هرات) is the capital of Herat province in Afghanistan. It is the third largest city of Afghanistan, with a population of about 397,456 as of 2006. It is situated in the valley of the Hari River, which flows from the mountains of central Afghanistan to the Karakum Desert in Turkmenistan. The city is linked with Kandahar and Mazar-e-Sharif via highway 1 or the ring road that stretches across the country. It is also linked to the city of Mashad in Iran through the border town of Islam Qala.