Overshadowed by Snowdonia to the north & the Brecon Beacons to the south, mid Wales is something of a `green desert`. Shrouded by Celtic mists, it baffled the advance of the English invaders, thus preserving the Welsh language in the west of Wales. The tranquil borderland of the Marches, offers a varied landscape truncated by rivers meandering to lowland plains. Limestone to the west & north of the old red sandstone of the Hereford Plain has given rise to exceptionally attractive hilly country with delightful, narrow valleys.