▁Vi ad uct , ▁to ▁the ▁south ▁by ▁Union ▁Street , ▁Aber de en ' s ▁main ▁thorough fare , ▁to ▁the ▁east ▁by ▁the ▁railway ▁and ▁the ▁Den ▁Burn , ▁now ▁flow ing ▁under ground , ▁and ▁to ▁the ▁west ▁by ▁Union ▁Terra ce ▁ ▁Con tr ary ▁to ▁popular ▁belief ▁the ▁area ▁is ▁not ▁a ▁natural ▁am ph it he atre ▁but ▁a ▁small ▁river ▁valley ▁with ▁a ▁late - V ict or ian ▁vi ad uct ▁constructed ▁at ▁the ▁North ▁end ▁in ▁ 1 8 8 9 . ▁ ▁The ▁am ph it he atre ▁was ▁formed ▁from ▁the ▁covered ▁remains ▁of ▁Den burn ▁Terra ce ▁after ▁demol ition . ▁ ▁The ▁park ▁is ▁surrounded ▁by ▁of ▁some ▁of ▁the ▁best ▁architecture ▁of ▁Aber de en , ▁prominent ▁among ▁which ▁are ▁His ▁Majesty ' s ▁Theatre , ▁St ▁Mark ' s ▁Church ▁and ▁the ▁Library ▁on ▁Ros em ount ▁Vi ad uct ▁to ▁the ▁north , ▁and ▁the ▁Tri ple ▁Kir ks ▁to ▁the ▁east . ▁ ▁On ▁the ▁park ' s ▁north ▁side ▁is ▁a ▁formally ▁plant ed ▁and ▁maintained ▁fl oral ▁cr est ▁of ▁the ▁city ' s ▁coat ▁of ▁arms . ▁ ▁At ▁the ▁Union ▁Street ▁end ▁of ▁the ▁gard ens ▁stands ▁a ▁group ▁of ▁m ature ▁el m ▁trees , ▁nearly ▁ 2 0 0 ▁years ▁old . ▁The ▁trees ▁stand ▁on ▁the ▁rem n ants ▁of ▁the ▁site ▁once ▁known ▁as ▁Cor bie ▁H augh : ▁Cor bie ▁in ▁Sc ots ▁meaning ▁crow , ▁and