The Liesgau was a shire (Gau) of the Duchy of Saxony in the early medieval period, roughly corresponding to the former Osterode district of Lower Saxony.
It was situated on the south-west side of the Harz Mountains in what is now the German state of Lower Saxony.
It was bordered by the following counties (list may be incomplete): Salzgau, Harzgau, Helmengau, Eichsfeld, Lochne, Suilberge.
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