Keiss (Scottish Gaelic: Cèis) is a fishing village at the northern end of Sinclairs Bay on the east coast of Caithness in the Scottish council area of Highland.Keiss Castle, which is now partially ruined, is located less than 1 mile north of the village centre, on sheer cliffs, overlocking the bay, and has been a major tourist attraction for many years. Keiss House replaced Keiss Castle around 1755.