Mixed forests of pine and fir-trees, beeches, limes, oaks and elms cover the mountains, but the thickest woods can still be found in the northern part of the republic, in Volyn. Kiev and Cherkassy lie in the midst of Ukrainian southernmost pine forest. The main Ukrainian river is the Dnieper. It is one of the longest European rivers and one of the republic's main source of hydroelectric power. The climate of the country is moderate.
Winter is rather mild, with no severe frosts but with regular snowfalls everywhere except the south.
The rivers and lakes freeze in winter. Summer is quite hot and dry, with occasional showers and thunderstorms. The fertile black soil is well watered in spring and autumn and gets plenty of sunshine in summer. Due to favorable climatic conditions, Ukraine is traditionally an agricultural area. It grows wheat, maize, buckwheat and other corn, red and green vegetables, all kinds of fruit, melons and berries.