Sorbian March
The Sorbian March (Latin: Limes Sorabicus, German: Sorbenmark, Upper Sorbian: Serbska marka, Lower Sorbian: Serbska marka) was a march (frontier district) on the eastern borders of the Carolingian Empire and the later Eastern Frankish Kingdom, during the 9th and 10th centuries. It was encompassing frontier regions along the Saale river, bordering the Sorbs and other Polabian Slavic tribes.