A Beaker people site at Llethryd Tooth
 Cave is located on this component country's Gower Peninsula, which also includes an unusual rock
 formation called the Hog's Head.
The highest waterfall in this political unit is called the Devil's Appendix and is located on the side of
 Cwm (k-OOM) Idwal. An grove of Yew trees at Overton may be the oldest in this place, where a causeway
 known as "the cob" connects the town of Holyhead to Anglesey. A Beaker people site at Llethryd Tooth
 Cave is located on this component country's Gower Peninsula, which also includes an unusual rock
 formation called the Hog's Head. People in this region hold spoken word festivals called eisteddfodau, and
 it includes the Wye River valley as well as a large earthern wall separating it from its eastern neighbor,
 Offa's Dyke. For 10 points, identify this component country of the United Kingdom represented on its
 official flag by a dragon.
The highest waterfall in this political unit is called the Devil's Appendix and is located on the side of
 Cwm (k-OOM) Idwal.
{Wales} [do not accept or prompt on "{United Kingdom}," etc]