Agri Dag (, ) is a ridge at the mid of the Armenian highland. It starts near sources of the Araxes river and stretches from the south bank as far west as Mount Ararat. The length of the ridge 200 km, the height - up to 3445 m. It was formed by a chain of volcanoes that arose along a major tectonic fault. The ridge is part of the watershed between the basins of the Caspian Sea and the Persian Gulf.