Wybunbury Moss is a National Nature Reserve and a Site of Special Scientific Interest. This internationally unique example of schwingmoor (floating bog) consists of a raft of peat, floating on a lake 13 metres deep. Many bogs originated during the last great Ice Age, however, it is thought that the subsidence of underlying salt-bearing rocks has modified Wybunbury Moss. As a result of this, a unique habitat for many rare animals and plants exists at the reserve.