The peat bogs on the banks of the Odet are classified as protected zones. They are fragile areas with high levels of humidity, where the ground temperature is several degrees lower than the ambient air temperature. Peat is inhospitable to most plants and in addition the water that feeds it is low in organic matter and often very acidic. There are however, numerous species of remarkable plants which are perfectly adapted to this environment.

Tourbière de Kerogan (the Kerogan peat bog)

This is a sphagnum bog, with moss that accumulates and slowly forms peat. Located in the woods of Stang Zu, this bog is home to specific, protected plants like the Drosera Rotundifolia (a carniverous plant also known as sundew).

Tourbière de Kernoter (The Kernoter Peat Bog)

Bog plants are less numerous here than at Kerogan, but there are two species of Drosera: intermediate Drosera and round leaved Drosera, as well as the Portuguese butterwort, another carnivorous plant.

Like all plants, they draw their food from water and the soil. However, because the area is very poor in nutrients, they supplement this by catching small insects. There is also cotton grass, recognizable by its woolly white « duvet ». It is possible to stroll through the bog on maintained paths..

With regards to wildlife, this bog is distinguished by the presence of the viviparous lizard, the brown lizard and in particular the spotted and flat Quimper snail, which is only found in Finistère.

Tourbière de Toulven (the Toulven peat bog)

This bog is not accessible to the public. There are many species including Drosera and the little egret, a protected bird species.