It is an artificial lake, it has also stream and forest. Rare flora and fauna. Boating and fishing, walking and cycling activities can be done in this place. The protected natural area since 1997. The official name "flood control reservoir of Szilas creek" (Szilas-pataki árvízvédelmi tározó). The lake formed in 1978 through the backwater of Szilas creek. The area was declared as protected land because there, around the lake, the surrounding reeds and lower and upper meadow of the 'valley' of the Silas creek, evolved a rich flora and fauna. A protected plant species are found here, such as ostrich fern (Matteuccia struthiopteris), different Orchids, Siberian Iris, cottongrass. Among the protected species here are praying mantis (Mantis religiosa) and European Peacock (Inachis io). The lake and the surrounding reeds provides nesting and resting place to one of the richest bird population in Budapest. Also in the area includes the neighboring forest of Cinkota with its sandy grassland remnants.

Lake Naplás (Hungarian: Naplás-tó, officially called Szilas-pataki flood control reservoir) is the largest lake of Budapest. The lake is artificial, surrounded by the second largest natural reserve of Budapest, including a moorland and a forest. Rare flora and fauna could be found here, therefore it has been a protected since 1997. It is the natural habitat of the European pond turtle. The lake itself is a fishing lake, but there are hiking and biking trails around it. It can be reached from the city by car or bike, or by the nearby public transportation.