The Alazani is a river that flows through the Caucasus. It is the main tributary of the Kura in eastern Georgia, and flows for 351 kilometres (218 mi). Part of its path forms the border between Georgia and Azerbaijan. The Alazani originates in the Greater Caucasus, south of the main ridge, in the northwestern part of the Akhmeta District. It flows initially to the south towards the town Akhmeta, then through the fruitful Alazani Valley of Kakheti towards the southeast. The Alazani is the center of the Georgian wine industry. For centuries, it was a main gateway for Persian invaders.