The presence of large wetlands offer an ornithological richness of international interest with the presence of migratory birds populations such as the Arctic loon. The western part of the Brest Bay (between the Arrée Mountains and the Black Mountains) is generally protected from the waves and thus acts as an inland sea. Capes, bights and troughs mark the landscape, which also contains many typical small ports.

With a mild and humid Atlantic climate, market gardening has quickly found its place, as evidenced by the cultivation of the “Plougastel strawberry”, which is renowned throughout Europe. The bocage network and the hamlets, often built using Logonna Stone or kersantite, contribute to the creation of a typical maritime atmosphere. The local architectural heritage has been deeply influenced by these two rock types that were exploited in the past.

Lastly, this area is marked by the presence of the Menez Hom Hill which dominates the scenery. From its 330 metres a.s.l., it offers a vast panoramic view over the neighbouring territory. Its moorlands testify to the elements harshness and compose a remarkable plant ensemble, showing the exceptional quality of the environment.