This section is characterized with steep and relatively narrow canyon, and rugged karstic geology and hydrology. Four enormous vales-size rifts appear in the mountainsides forming canyon walls, two from each sides of the river, intersecting with the main canyon almost perpendicularly. The Neretva receives only four small streams in this section, all running through these side-vales, which are relatively short. Going downstream from Jablanica, first two from each side are the Glogošnica stream, its eponymous canyon and small village, at the left, and the Grabovica stream with eponymous canyon and historical village, from the right side. Further downstream two much larger vales appear again on each side, first on the right the stream of Drežanka and its large and steep valley, with two eponymous villages, Donja (Lower) and Gornja (Upper) Drežnica, and than Mostarska Bijela, as one the most pristine vales in Bosnia and Herzegovina, with its eponymous uniquely characteristic subterranean stream, embedded deep into the Prenj mountain, on the left.