There is however a third option.
Take the back roads to the church at Llanddeusant with its youth hostel and find a parking spot. The lane S from the church has one by the river bridge but its not good if very wet.
Continue up this road then track up onto the open hillside. Save this for a clear day as the going is not always the most obvious and the views east across the Carmarthen Fan make the day. Heading just west of south the trig point eventually appears then its onward over featureless ground to the twin cairns of Garreg las.
Its possible to continue from here but the way back is by no means direct from any of the other tops. Instead retrace your steps taking in the view to the north as you head back to your vehicle.
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More photos from this trip