Archaeologists have found that an ancient artificial island in Scotland’s Loch Bhorgastail, long thought to be made of stone, was built on a large timber platform more than 5,000 years ago.
The site is on the Isle of Lewis. Researchers from the University of Southampton began excavating in 2021 and uncovered a timber structure forming the full base of what appears from the surface to be a stone mound.
Dr. Stephanie Blankshein, a University of Southampton archaeologist, said that the scale of the find was unexpected. Scattered pieces of wood were visible poking out beneath the island before excavations began, but the full extent of the timber structure underneath came as a surprise to researchers.
Radiocarbon dating placed construction between 3,500 and 3,300 BC, predating Stonehenge. At its earliest stage, builders laid down a wide wooden base spanning about 23 meters and covered it with brushwood.
Timber foundation traced back more than 5,000 years
The island went through several phases of development after that. Sometime in the Middle Bronze Age, roughly 2,000 years into its history, additional brushwood and stone were piled on top.
Activity at the site continued again in the Iron Age. At some point, a stone pathway was built connecting the island to the loch shore, though it now sits underwater.
Hundreds of pieces of Neolithic pottery were recovered from the surrounding water during excavation.
Archaeologists have discovered that a 5,500-year-old artificial island in Scotland was built on a massive timber platform, reshaping what we know about Neolithic communities. pic.twitter.com/wHECXExSa1
— Tom Marvolo Riddle (@tom_riddle2025) May 4, 2026
Matching construction dates have come from nearby sites across the Outer Hebrides, indicating the practice was not limited to this location but shared across the wider region.
Crannogs are a type of man-made island built in bodies of water across Scotland. Hundreds have been recorded in the country’s lochs, though what drove communities to build them remains unclear.
Blankshein said that the labor and resources required to construct them point to organized communities and suggest these sites held deep importance for the people who made them.
Scotland’s ancient artificial island part of a wider regional tradition
The island was first identified in 2009. Fieldwork since 2021 has drawn on excavation, radiocarbon dating, surveying, and core sampling to trace its development.
Researchers also used photogrammetry to build 3D models of the site, working with experts at the University of Reading. The process involves taking photographs from various angles and processing them into a unified digital model.
Shallow water presented a problem. Below 1 meter (3.28 feet), murky conditions, low light, and surface disturbances make consistent imaging difficult.
To work around this, the team developed a custom rig holding two wide-angle waterproof cameras at a fixed, measured gap between them. A diver moved the rig through the water while its position was tracked with centimeter-level precision, producing results on par with drone-based imaging.
Prof. Fraser Sturt, director of the Southampton Marine and Maritime Institute, said that shallow water has long frustrated underwater archaeologists, and the new approach helps address that directly. The findings are published in the journal Advances in Archaeological Practice.
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