Best natural monuments around Halkirk are found in the Scottish Highlands, offering diverse landscapes. The region features dramatic coastal scenery, ancient geological sites, and vast blanket bogs. These natural attractions showcase both geological formations and significant ecosystems.
Last updated: July 28, 2026
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Carefully arranged in a horseshoe pattern, the 4000 year old standing stones are thought to be unique in the North of Scotland. This is because normally the broad face of each stone faces the centre of the setting. Not so at Achavanich - here the edge faces the centre. Each stone was painstakingly cut from the bedrock of Caithness Flagstone using simple tools.
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This really is a beautiful place to visit and well worth a detour if you are passing close by. You can walk out to the viewing tower via the boardwalk but keep in mind that there is not a lot of space to pass visitors if you do take your bike with you.
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Holborn Head features some amazing coastal scenery. The path passes an impressive sea stack known as the Clett, with an arch on the west side. Be aware that the path is on the outside of the fence passing along some high cliffs, at one point quite close to the edge. If vertigo isn't a problem for you, when looking down at times you can spot sea caves at the bottom.
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Holborn Head features some amazing coastal scenery. The path passes an impressive sea stack known as the Clett, with an arch on the west side. Be aware that the path is on the outside of the fence passing along some high cliffs, at one point quite close to the edge. If vertigo isn't a problem, when looking down at times you can spot sea caves at the bottom.
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The Grey Cairns of Camster are two large Neolithic chambered cairns that are among the oldest structures in Scotland, dating to about 5,000 years ago. The cairns demonstrate complex neolithic architecture, with central burial chambers accessed through narrow passages. They were excavated and restored by Historic Environment Scotland in the late 20th century. The cairns were constructed in the third of fourth millennium BC in an empty, boggy and peat-covered moorland. Although the surrounding countryside is now inhospitable with little population, it was a fertile farming land in the Stone Age, only becoming covered in peat during the Bronze Age.
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The Grey Cairns of Camster are two Neolithic chambered cairns (a small round one and a large long one). They are among the oldest structures in Scotland, dating to about 5,000 years ago. The cairns demonstrate the complexity of Neolithic architecture, with central burial chambers accessed through narrow passages from the outside. They were excavated and restored by Historic Environment Scotland in the late 20th century and are open to the public. In 2017 I was able to crawl into every grave. The iron gates were open. https://en.wikipedia.org/wiki/Grey_Cairns_of_Camster
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A small freshwater loch on the west of the road, almost paired with Loch Stemster which is on the eastern side of the road. Loch Rangag is the site of castle Greysteil, the earth works, and some rubble is all that remains of this but it's a atmospheric site and a scheduled ancient monument.
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Two well preserved Neolithic chambered cairns. Excavations in 1865 found pottery, flint tools, bones and skeletons. It's now managed by Historic Scotland and open to the public (a short walk from the road). Bring a torch or bike light so that you can crawl in and explore the cairns properly.
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The region offers diverse natural features. You can witness the dramatic coastal scenery and impressive sea stack at The Clett Sea Stack, featuring an arch and sea caves. Inland, the Forsinard Flows present a vast expanse of blanket bog, part of the globally significant 'Flow Country', ideal for birdwatching. Additionally, the Achanarras Quarry is renowned for its Devonian Period fossils, offering a unique geological experience.
Yes, several sites blend natural settings with ancient history. The Grey Cairns of Camster are Neolithic chambered cairns, dating back 5,000 years, set within a natural moorland. The Achavanich Standing Stones, arranged in a unique horseshoe pattern, are another ancient site. You can also visit Loch Rangag, a picturesque freshwater loch associated with the atmospheric ruins of Greysteil Castle.
The area around Halkirk provides excellent opportunities for various outdoor activities. You can find numerous hiking trails, including easy walks like the Forsinard Boardwalk at the Flows. For cyclists, there are diverse cycling routes, from moderate loops around lochs to more challenging long-distance rides. Runners can also explore several running trails, particularly around Thurso.
Absolutely. The Forsinard Flows Viewing Tower is a great option, offering easy access via a boardwalk and a visitor centre. It's an excellent spot for nature observation and birdwatching. While not a highlight in our guide, the Achanarras Quarry allows visitors to search for and take home certain fossil finds, which can be a unique and engaging activity for families interested in geology.
The best time largely depends on your preferred activity. For coastal walks and enjoying the dramatic scenery at The Clett Sea Stack, spring and summer offer milder weather and longer daylight hours. Birdwatching at Forsinard Flows is particularly rewarding during migration seasons. While the ancient sites like the Grey Cairns of Camster are accessible year-round, be prepared for potentially wet and windy conditions, especially in autumn and winter.
The duration varies by site. A visit to The Clett Sea Stack, including a coastal walk, could take 1-2 hours. Exploring the Grey Cairns of Camster typically requires about an hour, allowing time to walk from the road and explore the cairns. For the Forsinard Flows Viewing Tower and boardwalk, plan for 1-2 hours to fully appreciate the landscape and wildlife.
Yes, The Clett Sea Stack near Holborn Head provides breathtaking views of the dramatic North Sea coastline and impressive geological formations. The Forsinard Flows Viewing Tower offers a unique vantage point over the vast expanse of the blanket bog, allowing you to observe the 'Flow Country' landscape and its wildlife.
The region is rich in geological interest. The coast near The Clett Sea Stack showcases dramatic sea stacks, high cliffs, and sea caves, formed by the powerful North Sea. Inland, the Achanarras Quarry is globally significant for its Devonian Period fossils, offering a glimpse into ancient marine life. The Achavanich Standing Stones themselves are carved from local Caithness Flagstone, demonstrating ancient craftsmanship with regional materials.
Parking is generally available at or near these sites. For the Grey Cairns of Camster, there's a short walk from the road where parking is usually found. The Forsinard Flows has a visitor centre with dedicated parking. For coastal areas like The Clett Sea Stack, parking might be found at nearby trailheads or designated coastal access points.
The Forsinard Flows are part of the 'Flow Country', one of Europe's largest and most intact blanket bogs. This unique ecosystem is a Site of Special Scientific Interest and an important habitat managed by the RSPB, supporting a variety of rare bird species like Greenshanks, Golden Plover, and Hen Harriers. Its vast, wild landscape and ecological importance make it a truly significant natural monument.
Many outdoor areas in the Scottish Highlands are dog-friendly, but it's crucial to keep dogs under close control, especially in areas with livestock or ground-nesting birds, such as the Forsinard Flows. Always follow the Scottish Outdoor Access Code, which advises keeping dogs on a lead or under close control around wildlife and farm animals. Specific rules for each site may vary, so check local signage.


Extend your search for the best caves by checking out these guides of the top ones around Halkirk: