Pilský Rybník, reservoir in Obecnice, Czech Republic

Pilský Rybník is a large water reservoir in the Czech Republic built on Pilský Stream. The lake sits in a forested valley surrounded by hills and has the capacity to hold approximately 1.6 million cubic meters of water.

The reservoir was constructed in the mid-19th century to supply water for mining operations in the region. After heavy rains in 1854, the dam collapsed and flooded the nearby village of Bohutín.

The reservoir was first called Sofiin rybník and was built on the site of an older pond named Pilka, whose name it later took. The green hiking trail along the valley links Bohutín with Tři Trubky, and a blue trail runs from Obecnice toward Rožmitál pod Třemšínem.

A green hiking trail runs along the valley from Bohutín to Tři Trubky, and a blue trail from Obecnice heads toward Rožmitál pod Třemšínem; a short yellow link climbs from the reservoir's northern edge to the summit of Tok. Bus line 15 from Příbram stops at Kozičín and at the forest edge by the Bohutín swimming pool, where small car parks serve visitors.

The Struhy canal, a 17.5 km masonry channel, linked the reservoir with the lower Lázská nádrž and carried water on to Březové Hory in Příbram. Unmaintained since 1960, it is buried in places, and proposals for its restoration have been made.