Rivas-Vaciamadrid is the 15th most populated city in the Community of Madrid, Spain. It belongs to the Madrid metropolitan area and is locat…Rivas-Vaciamadrid is the 15th most populated city in the Community of Madrid, Spain. It belongs to the Madrid metropolitan area and is located just 15 km from central Madrid, to the south-east. In the southern part of the municipality, the Manzanares river flows into the Jarama, which is part of the Lower Manzanares and Jarama Rivers Regional Park. Almost three quarters of the municipality form part of the park, making it an important ecological centre with numerous lakes and various species of wildlife and fauna.