The Kamchatka Peninsula has a very dense hydrographic network; there are about 14,000 rivers and streams in Kamchatka. But due to the close location of the main watersheds to the seas, the length of the Kamchatka rivers rarely exceed 100 km, and often do not exceed 20. But, despite their short length, the Kamchatka rivers are among the most full-flowing in Russia, they receive 15-25 liters of water per second from every square kilometer of the catchment area. The main part of their power is groundwater, a third is melting snow and about 10% is rain.
By the nature of the flow in Kamchatka mountain rivers dominate, they flow in narrow valleys with steep slopes, often form rapids. Many of them have a mountain character only in the headwaters, and in the lower part they have a calm flat current, break into sleeves and channels, wind a lot.
The largest rivers of the Kamchatka territory are the following: the Kamchatka River (758 km), Penzhina (713 km), Talovka (458 km), Vyvenka (395 km), Oklan (304 km), Tigil (300 km), Bolshaya (with Bystraya - 275 km), Avacha (122 km).