Lake Šas (Albanian: Liqeni i Shasit; Montenegrin: Šasko Jezero / Шаско Језеро, Šasko Blato / Шаско Блато) is a lake located north-east of Ulcinj, near the village of Šas, in Montenegro. It is bordered geographically by Briska Gora (Mali i Brisë) to the southwest, Fraskanjelsko Polje (Këneta e Fraskanjellit) to the east, Ambulsko Brdo (Mali i Amullit) and Šasko Brdo (Mali i Shasit) to the northeast and the Brisko Polje (Fusha e Brisë) to the northwest.