Ostrow Tumski was once an island in the River Odra, and here the history of Wroclaw began. After the city moved to the left bank of the Odra
in 1292, the island remained the base of ecclesiastical authority. In the 19th century the northern arm of the Odra was filled in and Ostrow
Tumski ceased to be an island, but there remains the Cathedral, the Archdiocesan Muserum and the Botanical Gardens.
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