O přehradě Nasijarvi

Näsijärvi is a large lake in the Pirkanmaa region of southern Finland, directly adjacent to the city of Tampere. Covering approximately 257 square kilometres, the lake is one of the oldest regulated water bodies in Finland, with water level control dating back to 1872 when the Tammerkoski rapids were harnessed for industrial milling. The reservoir holds an estimated 320 million cubic metres. Näsijärvi forms part of the Kokemäenjoki river system, flowing southward via the Nokianvirta channel. Tampere, Finland's second city, developed at the narrow isthmus between Näsijärvi and the lower lake Pyhäjärvi, taking advantage of the natural head difference for early industrial water power. Today the Näsijärvi shoreline within Tampere is characterised by parks, cultural venues, and the distinctive Näsinneula observation tower. The lake supports commercial and recreational fishing, with a passenger boat service operating to lakeside villages throughout the summer season.