Wrocław
Geography

Wrocław is located in the three mesoregions of the Silesian Lowlands (Wrocław Plain, Wrocław Valley, Oleśnica Plain) at an elevation of around 105–156 metres (Gajowe Hill and Maślickie Hill) above sea level. The city lies on the Oder River and its four tributaries, which supply it within the city limits – Bystrzyca, Oława, Ślęza and Widawa. In addition, the Dobra River and many streams flow through the city. The city has a sewage treatment plant on the Janówek estate.
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