Cernătești is a commune in Buzău County, Muntenia, Romania, located in the Subcarpathian hills, in the valley of the river Slănic.

It is composed of eight villages: Aldeni, Băești, Căldărușa, Cernătești, Fulga, Manasia, Vlădeni and Zărneștii de Slănic.

The 2002 Romanian census showed a population of 4,027 inhabitants.

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