Callanish Stone Circle III

Built around 2900-2600 BCE as part of the Callanish complex, this satellite circle served as a specific observing station within a Neolithic landscape observatory spanning the west coast of Lewis.

Sometime around 2900 to 2600 BCE, communities on the Isle of Lewis selected a low ridge southeast of their principal ceremonial site and erected a double ring of standing stones. The outer ring held at least thirteen stones. Within it, they placed a second, smaller setting of stones, creating nested enclosures on the hilltop. The stones were local Lewisian gneiss, quarried or gathered from outcrops nearby, and propped upright in their sockets with small boulders packed around the base.

The site was not chosen at random. The ridge offered clear sightlines to the north and northwest, and the monument was positioned to align with moonset at the northern extreme of the major lunar standstill, a celestial event occurring every 18.6 years. This alignment places Callanish III within a broader network of stone circles, standing stones, and other monuments that together formed what researchers have called the Callanish observatory complex. At least eleven satellite sites surround the main Callanish I monument, each apparently positioned with reference to specific astronomical events.

The circle remained in active use for perhaps 1,500 years, through the late Neolithic and into the Bronze Age. As the centuries passed, peat began to grow across the Lewis moorland, gradually burying the lower portions of the stones. By the medieval period, only the upper portions of the tallest stones were visible above the peat. When Sir James Matheson ordered peat clearance in the Callanish area after 1857, the full height of the stones and the fallen members of the circle were revealed for the first time in centuries.