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Milford Haven Waterway is a natural harbour in Pembrokeshire, Wales. The Haven is a ria or drowned valley flooded at the end of the last Ice Age formed by the Pembroke River and the Daugleddau estuary, and winds west to the sea. As one of the deepest natural harbours in the world, it is a busy shipping channel, trafficked by ferries from Pembroke Dock to Ireland, oil tankers and pleasure craft.
Wikipedia: Link

The Pembrokeshire Coastal Path (Welsh: Llwybr Arfordir Sir Benfro), is a designated National Trail. It is 186 miles long.
The southern end of the path is at Amroth. The northern end is St. Dogmaels. Here the path links with the Ceredigion Coast Path, which continues northwards.
The Pembrokeshire Coast Path forms part of the Wales Coast Path, an 870-mile long-distance walking route around the whole coast of Wales from Chepstow to Queensferry, which was officially opened in 2012.

The Wales Coast Path (Welsh: Llwybr Arfordir Cymru) is a long distance footpath which follows the whole of the coastline of Wales. It opened on 5 May 2012, and offers a 870 mile long route from Chepstow in the south to Queensferry in the north.
Wales is the first country in the world to provide a dedicated footpath along its entire coastline. The Path runs through eleven National Nature Reserves and other nature reserves, including those managed by The Wildlife Trusts or Royal Society for the Protection of Birds (RSPB).
Logo can be seen atSS0897 : Logo, Wales Coast Path.
Website: Link