Nantmel lies on the banks of the river Dulas near Llandrindod Wells in Mid Wales, and is close to the towns and villages of Rhayader, Crossgates and Builth Wells.

St Crynllo's church, founded by the saint during the 5th century, has been rebuilt twice. The present building was constructed at the end of the 18th century, but the base of the tower was built earlier in the 17th century. Some believe that the tower itself was built in the 13th century but no records have been found of this.

Llyn Gwyn, just over 2km south west of Nantmel, is a secluded yet interesting spot to visit. Although a man-made lake, it is unclear how Llyn Gwyn (White Lake) came to be here. Whilst some believe it was a Roman bath, others say that it was part of a Neolithic lakeside village. One author visiting the area found a stone pot on the shores of the lake when the water had fallen low one summer.

A stone isn't the only thing to be found in Nantmel, however. On 26th May 1899, James Marston of Cwmdauddwr happened to discover some hidden treasure whilst hunting foxes on the hills above Nantmel. The treasure included a gold necklet, a gold armlet, a gold ring with an onyx stone, a piece of gold scroll and a small plate of embossed gold. Whoever the treasure belonged to was certainly rich, but James Marston probably wasn't the person intended to find all the gold!