Shahr-e Ray (Persian: شهر ری, lit. 'City of Ray') or simply Ray (Shar e Ray; شهرری) is the capital of Ray County in Tehran Province, Iran. Formerly a distinct city, it has now been absorbed into the metropolitan area of Greater Tehran as the 20th district of municipal Tehran, the capital city of the country. Ray today has many industries and factories in operation. It is connected via the rapid transit system of Tehran Metro to the rest of Greater Tehran.