Built on the Isle of Gavrinis some five thousand years ago, this tumulus is one of the most interesting megalithic monuments in Brittany. It is made of stones piled on a hillock and is 6m/20ft high and 50m/164ft in diameter. A 14m/46ft-long covered gallery, made of 9 cap stones resting on 23 carved supports, leads to a small funeral chamber (2.5m²/8ft²) which is roofed in by a single granite slab resting on supports adorned with carvings.