Donegal contains a wide range of habitats. These include mountains; moor land, bog, lakes, sand dunes and sea cliffs, each of which contains its own unique flora and fauna. The bogs (peat land) of Carrick are surprisingly rich in wildlife – their formation dates back over 4000 years. Large areas became waterlogged and the plants and trees did not decompose properly. This semi-decayed material over many centuries formed the peat bogs. These bogs are now an important asset to the community and turf is still used as a main supply of fuel for heating.