Brebu is a commune in Prahova County, Muntenia, Romania. It is composed of four villages: Brebu Mânăstirei, Brebu Megieșesc, Pietri…Brebu is a commune in Prahova County, Muntenia, Romania. It is composed of four villages: Brebu Mânăstirei, Brebu Megieșesc, Pietriceaua and Podu Cheii. The commune is located in the northern part of the county. The river Purcaru flows through it.