Belgrade Fortress
Belgrade Fortress , consists of the old citadel ( Upper and Lower Town ) and Kalemegdan Park ( Large and Little Kalemegdan ) on the confluence of the River Sava and Danube , in an urban area of modern Belgrade , the capital of Serbia . 
<triplet> Belgrade Fortress <subj> Belgrade <obj> located in the administrative territorial entity <triplet> Kalemegdan Park <subj> Belgrade Fortress <obj> contains <subj> Belgrade <obj> located in the administrative territorial entity <triplet> Sava <subj> Danube <obj> mouth of the watercourse <triplet> Danube <subj> Sava <obj> tributary <triplet> Belgrade <subj> Sava <obj> located in or next to body of water <subj> Danube <obj> located in or next to body of water