The western shore of the Käsmu peninsula has one of the densest concentrations of glacial erratic boulders in northern Europe — the kivikülv or "stone sowing", where the receding ice sheet dropped hundreds of large granite boulders along a few kilometres of coast. Some of the largest — Matsikivi, Sõmer, Vaarakivi — stand three to four metres above the water and have names of their own in local tradition.
The boulders are best reached on the western half of the peninsula loop trail; the most photographed cluster is at the tip near the lighthouse. In low evening light the granite glows pink against the dark water — one of the great Estonian landscape images.