▁Tas ca ▁( 1 1 th - 7 th ▁century ▁BC ) ▁ ▁References ▁ ▁Category : C ities ▁and ▁towns ▁in ▁Ab ru z zo ▁Category : Ar chi , ▁Ab ru z zo <0x0A> </s> ▁The ▁T ians han ▁Vol can ic ▁Group ▁is ▁a ▁vol can ic ▁field ▁in ▁the ▁T ians han ▁Mountains ▁in ▁North west ▁China . ▁The ▁histor ically ▁active ▁C one ▁of ▁Pe chan ▁is ▁within ▁the ▁group ▁( also ▁known ▁as ▁Pe ish an , ▁Ba ish an , ▁Hoch an , ▁Ag h ie , ▁B ich bal ick , ▁Kh ala , ▁and ▁Bos chan ). ▁The ▁vol cano ▁is ▁ 4 4 0 ▁km ▁south west ▁of ▁U rum qi , ▁X in ji ang . ▁ ▁E ru ptions ▁ ▁Two ▁er u ptions ▁are ▁known ▁from ▁T ians han , ▁in ▁ 5 0 ▁AD ▁( ± ▁ 5 0 ▁years ) ▁and ▁ 6 5 0 ▁AD ▁( ± ▁ 5 0 ▁years ). ▁The ▁book , ▁As pect s ▁of ▁Nature ▁in ▁D ifferent ▁Land s ▁and ▁D ifferent ▁Cl im ates , ▁Volume ▁ 1 , ▁reports ▁that ▁Pe chan ▁cone ▁sent ▁out ▁streams ▁of ▁la va ▁in ▁the ▁sevent h ▁century . ▁The ▁Chinese ▁General , ▁Te u - H ian ▁( who ▁was ▁fle eing ▁from ▁the ▁Chinese ▁army ) ▁said ▁that ▁when ▁clim bing ▁the ▁T ians han ▁Mountains , ▁saw ▁" The ▁Fire ▁Mountains ▁which ▁send ▁out ▁masses ▁of ▁mol ten ▁rock ▁which