Milford Haven is a natural deep water port that handles around a fifth of the UK's energy through oil and gas imports.

BBC: Urgent question: Trident

If Scotland's First Minister managed to get rid of the nuclear-armed submarines based in Faslane, there would be a welcome for them - if not in the hillsides - in the deep waters of Milford Haven.

BBC: Clinical strike or homing missile?

At the top of Mackinnon Pass, the high point of Milford Track in every sense, are some of the most spectacular views of the deep, U-shaped Arthur and Clinton valleys on either side.

FORBES: Hiking Middle-Earth