The Azerbaijani Republic borders on Russian Federation and Republic of Georgia in the north, Republic of Armenia in the west, Republic of Turkey and Islamic Republic of Iran in the south. On the eastern side, it is surrounded by the Caspian Sea. While the central part of the country is predominantly flat, the northern, western and southern parts are mountainous. The highest mountains are in the north and belong to the Great Caucasus range. The highest peak is Mount Bazarduzu (4.466 meters). In the south, the Talysh mountain range stretches along the border with Iran. The country is a mountainous area, about 7 percent of it is arable land. The Kura River Valley is the area's major agricultural zone. The climate of Azerbaijan is extremely varied, due to the geographical heterogeneity of the country. There are, in fact, as many as nine different climate zones. In the central part, the mean January temperature is about 3 degree C., the mean July temperature is 27 degree C.