During the post war years, Milford Haven was affected by a gradual demise in the fishing industry. This period coincided with the development of the town as one of the world's major oil ports.

In the 1960's and 70's, four oil refineries were sited at Milford Haven, although presently only two remain. This walk follows the boundary of the decommissioned Esso refinery. However, there are now plans to reopen the site as a Liquified Natural Gas (LNG) plant in the future.

The area is now owned by Exxonmobil. Extensive partnership work with the Countryside Council for Wales (CCW) and the Pembrokeshire Coast National Park Authority has taken place. Part of the area has been designated as a Nature Reserve to ensure that the habitats and flora and fauna communities are safeguarded well in the future.

The site is a haven for mallard, widgeon, teal, gadwall, common snipe, little grebe, curlew, redshank, grey heron, lapwing, dunlin, herring gull, and the lesser black backed gull. Other bird species include stonechat, skylark, barn owl, chough, and peregrine.

Look out for badgers, horseshoe bat, pipistrelle and long-eared bat, field voles, stoats, rabbits and fox. Reptiles and amphibians including adder, grass snake, slow-worm, common lizard, frog, toad, palmate newt may sometimes be spotted. You may also see a great variety of butterflies and moths.

There are a fantastic variety of plants here - 302 species of vascular plants alone - three of which are recorded as being nationally scare; these are: dittander, greater broomrape and varigated horsetale.