Look out for: St Govan's Chapel, choughs, spectacular limestone cliffs/coastal scenery

Used by the Ministry of Defence as a firing range, there has been relatively little human access to this area of the south Pembroke coast dominated by dramatic limestone cliffs. This lack of disturbance has produced a rich, unspoilt range of habitats for wildlife (apparently the wildlife don't mind the noise too much!).

Stack Rocks (Elegug Stacks - elegug is Welsh for guillemot) are two detached pillars of limestone. Also, look for the Green Bridge, a natural arch carved by the waves, and the Cauldron on the promontory to the east. The tops of the Stacks and the ledges below are crammed with guillemots and razor-bills, and fulmar and kittiwake nest on the cliffs along with herring and black-backed gulls. In winter there's thrushes, crows and golden lapwings on the inland plateau. The rich grassland of the plateau is home to a range of reptiles, smaller mammals and invertebrates.

Rare butterflies like the dark green fritillary live here, too. St Govan's Chapel, a 13th century single-chamber stone cell at the climax of the walk, can be reached by 52 rough stone steps (may be slippery). The water from St Govan's Well, below the chapel, was famous for its healing powers, though the well is dry now.