Milford Haven is a magnificent natural harbour in Pembrokeshire, west Wales. Lord Nelson regarded it as the second best harbour in the world after Trincomalee in Ceylon (now Sri Lanka).
The Haven is a drowned river valley — aria. Around 50 million years ago rocks and sediment that had been beneath the sea were uplifted to form land. A river valley developed on the newly created land, following the line of a fault.
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