Merlin's Oak stood at the junction of Priory Street and Old Oak Lane on the eastern edge of medieval Carmarthen. By the early 19th century it was already a dead tree, kept upright by a casing of iron bands and infill, but it lived on as a civic emblem because of the prophecy that the town would fall when the oak did.
The tree was finally removed in 1978 after it became a traffic hazard. A fragment is preserved in the Carmarthenshire County Museum at Abergwili, and the site is marked on the pavement at the junction with a plaque and a few sections of the original trunk embedded in stone.
The site is a short detour on the walk between the town centre and Carmarthen Priory. It takes 5 minutes; it is more a piece of local folklore than a destination, but worth the small detour.