Dùn Èistean is a multi-period archaeological site on an inter-tidal sea stack on the north east coast of the Isle of Lewis, near the village of Knockaird (Cnoc Àrd, Nis) in the area of Nis (Ness) in the Western Isles of Scotland. It is accorded the status of traditional stronghold of Clan Morrison, once a highly powerful family within the Lordship of the Isles, in local oral tradition. The ruins of two large buildings and groups of interconnecting cellular structures can be seen amongst the grassy tussocks on the top of the island, as well as an artificial pond and a low turf wall enclosing the site. The most prominent feature of the site is a large circular mound of rubble situated on the highest point of the stack, on the north east side of the site. The topographical survey of the site