▁were ▁the ▁Bat av ians , ▁a ▁similarly ▁new ▁formation , ▁apparently ▁made ▁up ▁of ▁in - coming ▁Ch atti , ▁with ▁a ▁possible ▁contribution ▁of ▁E bur ones . ▁To ▁the ▁n ortheast ▁of ▁the ▁T ung ri , ▁near ▁the ▁Rh ine ▁were ▁the ▁C ug erni , ▁who ▁are ▁thought ▁to ▁be ▁Sic amb ri , ▁and ▁then ▁around ▁the ▁area ▁of ▁C ologne ▁and ▁Bonn ▁the ▁U b ii ▁were ▁settled . ▁ ▁Location ▁ ▁Pl iny ▁the ▁E lder ▁is ▁the ▁first ▁writer ▁to ▁mention ▁the ▁T ung ri ▁in ▁Gall ia ▁Belg ica , ▁in ▁his ▁Natural ▁History . ▁He ▁notes ▁that ▁their ▁territory ... has ▁a ▁spring ▁of ▁great ▁ren own , ▁which ▁spark les ▁as ▁it ▁burst s ▁forth ▁with ▁b ub bles ▁in numerable , ▁and ▁has ▁a ▁certain ▁fer ru gin ous ▁taste , ▁only ▁to ▁be ▁perce ived ▁after ▁it ▁has ▁been ▁dr unk . ▁This ▁water ▁is ▁strongly ▁p urg ative , ▁is ▁cur ative ▁of ▁t ert ian ▁fe vers , ▁and ▁dispers es ▁ur inary ▁calcul i : ▁upon ▁the ▁application ▁of ▁fire ▁it ▁assumes ▁a ▁tur bid ▁appearance , ▁and ▁finally ▁turns ▁red ▁ ▁It ▁has ▁been ▁suggested ▁that ▁this ▁refers ▁to ▁the ▁well - known ▁waters ▁of ▁Sp a ▁in ▁the ▁province ▁of ▁Li ège , ▁or ▁else ▁to ▁waters ▁found ▁at ▁T ong eren , ▁which ▁are ▁suit ably ▁iron - b ear ing , ▁and ▁today ▁referred ▁to ▁as ▁the ▁" P lin ius ▁bron