Tulach an t-Sionnaich

Tulach an t-Sionnaich ("Mountain of the Fox"), is a cairn at the northern end of Loch Calder in Caithness, Scotland that has been expanded over time.

The excavations revealed that the monument was initially a square passage tomb within a round cairn of 10.5 metres (34 ft) diameter.

After some time the entire structure was covered by a long cairn, surrounded by a low external wall, whose southern end extended beyond the old façade.

It lay roughly east of the axis of the heel-shaped cairn, probably in order to make better use of a natural ridge, and to raise the height, which apart from the southern end is nowhere above 0.9 metres (3 ft).

The southwestern side, including the chamber of Tulach an t-Sionnaich, has been eroded by the rise in water level of Loch Calder, but the main part of the cairn has survived and is covered with grass.