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 fund materials of the Chelyabuglrazvedka 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).