The drive from Belgrade, Serbia to Sarajevo in Bosnia and Herzegovina took around five hours. We drove west on Highway E-70, south on Route 20, then southwest on Routes 136 and and 26, all mountain roads, until we were driving side by side the Drina River to the Karakaj Border. Our Tour Director said that the Drina is the largest tributary of the Sava River and forms a large portion of the border between Serbia and Bosnia and Herzegovina. At that moment, we were on the Serbia