 Southern flank of the Great Caucasus ridge descended to Alazan-Ayrichay valley (in some sources Alazan-Haftaran valley, whereas in others it is considered as one of the Kur River valley parts) that in some places is parallel to the mentioned ridge.Said above valley begins from Georgia and is 210 km long and 30 km wide in Azerbaijan.Nialdagh ridge which elevation reaches up to 2100m high is extended parallel to the Great Caucasus one apart through Lahidge valley.