sentences:  In contrast to the central part of the Upper Silesian Industry Area a short distance to the north, Rybnik enjoys the reputation of a "green" city having a relatively clean environment.While the city is not a centre of tourism, it does have various interesting sights and opportunities for recreation.To the north-east of the built-up area, there is a reservoir ("Zalew Rybnicki") on the river Ruda, which serves as a cooling water source for the power station.