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Włocławek (Polish pronunciation: [vwɔˈt͡swavɛk] ) (German: Leslau or Alt Lesle, Yiddish: וולאָצלאַוועק, romanized: Vlatzlavek) is a city in the Kuyavian-Pomeranian Voivodeship in central Poland along the Vistula River, bordered by the Gostynin-Włocławek Landscape Park. As of December 2021, the population of the city is 106,928.Founded in the 9th century, Włocławek is located in the historical region of Kuyavia, and was its administrative center and main city in the Middle Ages. Nowadays, Włocławek is the third largest city of the Kuyavian-Pomeranian Voivodeship (after Bydgoszcz and Toruń) and the main cultural and economic center of eastern Kuyavia. It is the seat of the Roman Catholic Diocese of Włocławek, one of the oldest dioceses in Poland, since the 12th century, with the landmark Gothic Włocławek Cathedral listed as a Historic Monument of Poland. Poland's largest hydroelectric power plant is also located there.