I have often looked across the Pentland Firth from Orkney, from where it is possible to see mountains ranged across far north of mainland Scotland. I have less often looked the other way.

An afternoon walk on the hills above Achiltibuie, northwest Scotland, included spectacular views and atmospheric optical effects.

This afternoon, the low winter sun cast a subtle circular halo in the sky above Balnakei in the far northwest of Scotland.

We have been walking a series of conjoined fields, moving between the broch of Càrn Liath and Dunrobin Castle.

Today we moved to the eastern end of the study area where there are a series of ploughed fields between the Iron Age broch of Càrn Liath and the Dunrobin Castle estate.

Today we completed our survey of a large block of ploughed fields at the western extreme of the study area.

We're moving even further west along the ploughed fields of the coastal plain. Great excitement this afternoon following the discovery of an arrowhead.

Today we moved further west across the study area towards the present-day estuary of Loch Fleet.

More fields investigated, along with a visit to a chambered cairn and Dunrobin Castle Museum.

Today we walked more low-lying fields near Golspie, exploring areas on the edge of a former coastal wetland.

This archaeological fieldwalking survey is investigating an unusual concentration of Neolithic and Bronze Age artefacts that has been found along the shoreline of Loch Fleet, near Golspie in northern Scotland.