The Birsig (also called Börsegraben in Alsace) is a Rivière free - Suisse.
In the perimeter of the city, the river runs in its natural bed although its banks are reinforced so as to prevent that the risings do not cause a damage in the city. In certain districts, blocks of houses were built directly on its banks. Used during many years as natural sewer, it was known downtown under the name of the large cesspool (in German of die large Kloake ) and transported several diseases, such as the Choléra and the Typhus.
Nowadays, the near total of the course of Birsig on the territory of the Canton of Basle-City is underground. Only the part skirting the Zoo of Basle is visible on a few hundred meters.
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