Crathes Castle & Highland Boundary Geology Half-Day Tour

Rocks older than 600 million years lie exposed on the walk to Crathes Castle.

A half-day guided tour from Aberdeen combines a 16th-century castle and its walled gardens with the geological story of the Dee Valley and Highland Boundary Fault. Your guide is Steve Adams, a geologist with 45 years of experience who explains why Royal Deeside looks the way it does: how the River Dee carved its valley, why Crathes stands exactly where it does, and how Scotland's contrasting landscapes were forged along a single great fault line. The tour includes walks at Perthumie Bay across metamorphosed ocean-floor rocks, a panoramic stop at the Highland Boundary Fault, coastal geology at Stonehaven, and a guided exploration of Crathes Castle interior and gardens. No geology background is needed. Bottled water and snacks are provided. Cruise pickup is available at Aberdeen South Harbour.

Step-by-step itinerary

Explore geology and Crathes Castle

• Walk Perthumie Bay ancient rocks
• Stop for Highland Boundary Fault views
• Take short coastal geology walk
• Tour Crathes Castle and gardens

The experience

The tour starts with a guided walk at Perthumie Bay, where you'll stand on metamorphosed ocean-floor sediments more than 600 million years old: rocks that form the foundation of Scotland's Highland Terrane. From there, a panoramic stop at the Highland Boundary Fault gives you sweeping views across the geological line that splits Scotland into Highlands and Lowlands. A short coastal walk at Stonehaven follows, where volcanic flows and ancient river deposits sit side by side, the rocks that built Scotland's central Lowlands. Steve Adams, your guide, has spent 45 years reading stone and knows how to make the deep history beneath your feet matter.

Crathes Castle is the grand finale: a 16th-century tower house famous for its walled gardens, ancient yew hedges, and 400 years of family heritage at the gateway to Royal Deeside. You'll explore both the castle interior and the gardens with time to take in the surroundings and understand why this castle stands exactly where it does: a question the geology of the valley answers. The tour includes bottled water and snacks. An air-conditioned vehicle carries the group between stops. Cruise passengers can arrange pickup at Aberdeen South Harbour.

What’s included

• Bottled water and snacks throughout the tour.
• air-conditioned vehicle between stops.
• guided walks at Perthumie Bay, Stonehaven, and Crathes Castle.
• entry to Crathes Castle interior and gardens.
• cruise pickup at Aberdeen South Harbour (available on request).

Before you book

Days and timesNext departure: 9 Aug 2027

Book up to2d before

AgesAdult (16 to 64 years) · Senior (65 to 90 years) · Youth (12 to 15 years) · Under 12: can't be included in the booking

GroupUp to 6

Live guideEnglish

Meeting point and pickupNo hotel pickup: you go to the meeting point. Ends back at the starting point.

Cancellation and refundsFree cancellation up to 24 h before the start. After that, no refund.It may be canceled if the minimum number of travelers isn't reached. If that happens, you're offered another date or a refund.

Prices and times updated 7 days ago

Good to know

Moderate physical levelPets welcomePublic transport nearbyNot for heart conditions

Operated by Scotland 'On The Rocks' GeoTours

Is this one for you?Five hours leaves room for breakfast before the tour or a meal in Aberdeen afterward, but not both. Book this if you want the geology and the castle without eating up your whole day in port or on land.

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Top questions

Can children come?

Yes. Ticket types: Youth (12 to 15 years). Under 12: they can't be included in the booking.

What exactly is the Highland Boundary Fault and what will I see there?

The Highland Boundary Fault is the great geological line that splits Scotland into Highlands and Lowlands. On this tour, you'll stop at a panoramic viewpoint where you can see the bigger picture of how Scotland's contrasting landscapes were forged along this single fault line.

Do I need to know anything about geology before I book this tour?

No geology background is needed. Most guests don't have one. Steve Adams, your guide, has 45 years of experience and a knack for making rocks come alive, so he explains the story in a way that makes sense whether you've studied geology or not.

How much walking is involved in this half-day tour?

The tour includes a guided walk at Perthumie Bay, a short coastal walk at Stonehaven, and moderately steep walks to explore Crathes Castle interior and gardens. You should have at least a moderate level of physical fitness. The cliff and castle entry walks are moderately steep.

Can I book this tour if I'm arriving on a cruise ship?

Yes. Cruise pickup is available at Aberdeen South Harbour, making it convenient to join the tour and return to your ship within the half-day timeframe.

What is Crathes Castle and why does it matter geologically?

Crathes Castle is a 16th-century tower house at the gateway to Royal Deeside, famous for its walled gardens and ancient yew hedges. Geologically, it stands exactly where it does because of the Dee Valley's formation: the river carved the valley, and the castle's location reflects the underlying rock and landscape shaped by the Highland Boundary Fault.