Farah is the capital and largest city of Farah Province in western Afghanistan. It is located on the Farah River, close to the border with …Farah is the capital and largest city of Farah Province in western Afghanistan. It is located on the Farah River, close to the border with Iran. It is one of the largest cities of western Afghanistan in terms of population, with about 1.5 million people living in its urban area.