Much of Wales' diverse landscape is mountainous, particularly in the north and central regions. The mountains were shaped during the last ice age, the [[Devensian glaciation]]. The highest mountains in Wales are in [[Snowdonia]] (), of which five are over . The highest of these is [[Snowdon]] (), at . The 14 Welsh mountains, or 15 if including Garnedd Uchaf - often discounted because of its low [[topographic prominence]] - over high are known collectively as the [[Welsh 3000s]] and are located in a small area in the north-west. The highest outside the 3000s is [[Aran Fawddwy]], at , in the south of Snowdonia. The [[Brecon Beacons]] () are in the south (highest point [[Pen y Fan]], at ), and are joined by the [[Cambrian Mountains]] in [[Mid Wales]] (highest point [[Pumlumon]], at ).