The Dolmen de Séchebec is a megalithic tomb located in the commune of Saint-Avit in southwestern France. Dating back to the Neolithic period, around 3500 BCE, it consists of several large standing stones supporting a large flat stone that forms the roof of the chamber. The site is notable for its well-preserved carvings, which include geometric shapes and animal figures. It is believed to have been used for burial rituals and is one of several megalithic sites in the area.