The Kronotskaya River is located on the east coast of Kamchatka, northeast of Petropavlovsk-on-Kamchatka. It is about 45 km long, with a total drop of 375 m. On its way from Kronotsky Lake to Kronotsky Bay, the river crosses two different areas both in relief and geological structure: in its upper reaches - the Eastern Volcanic Area, in its lower reaches - the Kronotsky coastal plain.

This article is a summary of the results of oil prospecting hydrogeological studies conducted by the author in 1952-1954 within the Chelyabinsk brown coal region between 61-62° E and 54°20'-55°3(U N latitude. In addition to the data of our own research, we used the stock materials of the Chelyabuglezvedka trust, including the works of V* N. Kulakova, A. P. Sirman, P. A. Kiselev, and others. Some data on the hydrochemistry of the Chelyabinsk region are given in the work of M. S. Gurevich (VSEGEI, 1953).