Shurdhah (Albanian: Ishulli i Shurdhahut) is an island in northern Albania in the Vau i Dejës Reservoir.

The town was strategically located on the old road from the Adriatic Sea to Dardania and served as a resting point along the trade route.

[5] The island was the original settlement of the feudal Lekë Dukagjini patriarch, famous for the rules of the Kanun.

The see of Sardë shortly comprised also the Diocese of Dagnum (Dagno, Daynum, Danj; Daynensis), founded as suffragan of Archbishopric of Antivari (now Bar, in Montenegro) during the second half of the fourteenth century, which was united with Sarda by Pope Martin V in 1428.

The bishopric of Sardë (Sardoniki) itself was suppressed no later than 1600, allegedly in 1491 when Pope Innocent VIII joined it to the Diocese of Sapë (Sappa), and the united sees were suffragans in the ecclesiastical province of the Metropolitan Archdiocese of Antivari until the end of the eighteenth century.