▁sea , ▁which ▁they ▁are , ▁but ▁the ▁sea ▁of ▁ 1 2 0 , 0 0 0 ▁years ▁ago . ▁Sea ▁levels ▁have ▁changed ▁several ▁times ▁since ▁then ▁and ▁are ▁now ▁much ▁lower , ▁causing ▁the ▁ancient ▁beach ▁to ▁be ▁susp ended ▁in ▁the ▁cl iff ▁above ▁the ▁present ▁level . ▁Stand ▁on ▁the ▁beach ▁and ▁look ▁back ▁towards ▁the ▁cl iff , ▁and ▁you ▁will ▁see ▁a ▁wall ▁of ▁the ▁rounded ▁rocks ▁waiting ▁to ▁break ▁away ▁and ▁join ▁those ▁on ▁the ▁beach ▁today . ▁ ▁Work ▁was ▁completed ▁in ▁December ▁ 2 0 0 5 ▁on ▁diver ting ▁and ▁tre ating ▁the ▁se w age ▁which ▁used ▁to ▁be ▁depos ited ▁off sh ore ▁here ; ▁it ▁is ▁now ▁safe ▁to ▁sw im ▁in ▁the ▁c ove . ▁ ▁P orth ▁Nan ven ▁featured ▁as ▁one ▁of ▁the ▁ 1 0 ▁Best ▁Be aches ▁in ▁the ▁UK ▁ ▁References ▁ ▁Gallery ▁of ▁images ▁ ▁Category : Be aches ▁of ▁Pen with <0x0A> </s> ▁Pon tr hy df end iga id ▁is ▁a ▁village ▁in ▁Cer ed ig ion , ▁Wales . ▁It ▁lies ▁on ▁the ▁western ▁fl ank ▁of ▁the ▁Camb rian ▁Mountains , ▁between ▁Dev il ' s ▁Bridge ▁and ▁T reg aron . ▁The ▁village ▁lies ▁on ▁the ▁River ▁Te ifi , ▁whose ▁source ▁is ▁just ▁ 3 ▁miles ▁( 5   km ) ▁to ▁the ▁east ▁at ▁L lyn ▁Te ifi . ▁The ▁community ▁of ▁Y str ad ▁F fl ur , ▁which ▁Pon tr hy df end