Alignement de menhirs de Pleslin-Trigavou, Stone row in Pleslin-Trigavou, France.

The Alignement de menhirs of Pleslin-Trigavou is a megalithic arrangement of white quartz blocks arranged in parallel lines across an open field. Most of the stones now rest on the ground, though some remain standing in their original upright positions.

The rows of white quartz blocks at Champ des Roches date from the Neolithic; a survey in 1861 recorded seven rows reaching up to 3.5 m in height, more stones than survive today. The site was classified as a monument historique in 1889. Blocks in the fields to the west may belong to the same alignment, which would nearly double its length.

The site is also called Cimetière des Druides, and a tradition recorded as still alive in 1850 brought people to the stones on Saint Peter's Day (and, in the French account, Saint John's), with banquets and bonfires seen as a survival of Druidic custom. Legend says fairies building Mont Saint-Michel left the stones here. A collection of oaks from the dispersed botanical garden of the Dinan area, including sessile, pedunculate, holm and cork oaks, was planted at the site.

The stones sit in an open field and are easy to walk around on foot. Visit during daylight hours with good lighting to best see the white quartz stones standing out against the green surroundings.

Local folklore tells of fairies who supposedly dropped these stones while moving materials elsewhere. The tale reveals how this place has captured people's imagination through the centuries.