The main tributary of the Kura is the Araz River. Most of Azerbaijan's rivers are in the Kura basin. In the plains the rivers are used for crop irrigation. Most of the 250 lakes in Azerbaijan are small. Climate Azerbaijan has a unique diversity of climates with nine climate zones out of thirteen existing zones.
Summers are dry in the lowlands.
In the lowland, precipitation decreases in the winter, and in the mountains and hills, it decreases primarily from April to September.