Ballachly is interesting in that it seems to be strategically placed to link brochs towards the coast with those at Camster and Mybster and along the banks of the River Thurso. Without this broch, it looks as if lines of communication across the Highlands from the coast would not have been possible. There is evidence of a ditch around the broch as well, which may well have been a moat.
Park at Loch Stemster and walk along the track to Ballachly and you will see the grassy mound of the broch over on the right.
Reproduced by permission of Ordnance Survey on behalf of HMSO. © Crown Copyright. All rights reserved.
Disclaimer: Some brochs were built with military defensive purpose, and as such can be situated in extremely dangerous areas, such as on the edge of cliffs and ravines. Additionally, these are Iron Age structures, most of them in ruins, and they are extremely hazardous, with crumbling stone walls and hidden chambers. Existing walls, lintels, and passages could collapse at any time. The information here is provided free but it is your responsibility to ensure its accuracy, ensure your own safety, and acquire permissions for access where necessary. Accessing brochs is done entirely at your own risk.