Bolghar
It was situated on the bank of the Volga River , about 30 km downstream from its confluence with the Kama River and some 130 km from modern Kazan in what is now Spassky District . 
<triplet> Volga River <subj> Kama River <obj> tributary <triplet> Kazan <subj> Volga River <obj> located in or next to body of water