Gandja is the second largest city in the country after Baku. The area is famous for many mineral springs and unique medicinal oil – Naphthalan to treat naturally some dermatological, rheumatic and neurological diseases. The tourist from all over the world visits Gandja to admire Goygol which is a large lake with rich fish fauna surrounded by mountains. The color and the clarity of the water is striking - it is the purest of many mountain water basins in the Caucasus. The steep banks of Goygol are covered with dense oak and hornbeam forests.