The annual Ras Dewi Sant event, organised by Man-Up UK, is underway.
At 8am this morning, more than 40 competitiors set off from Abereiddy for the brutal full coastal marathon.
An hour later, more than 100 runners left St Davids Rugby Club, following a 'shotgun' start, for the half marathon event.
Marshals and water stations have been strategically placed around both courses, with all runners aiming to get back to the finish line on the rugby pitch.
Full report and pictures to come on www.westerntelegraph.co.uk/sport and in next week's Western Telegraph.
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