Sections
Geographically and hydrologically, the Neretva is divided into three sections.
Its source and upper reaches are located deep in the Dinaric Alps, at the foot of the Zelengora and Lebršnik mountains, specifically below the Gredelj Pass. The river's source is 1,227 metres above sea level and consists of five small separate springs. Over the first 90 kilometres, the Neretva flows through two deep, narrow canyons and two wide, fertile valleys—around Ulog and Župa Komska—before reaching the town of Konjic. This part is known as the Upper Neretva (Gornja Neretva in Serbo-Croatian). Here, the river flows from east-southeast to north-northwest, like most rivers in Bosnia and Herzegovina that belong to the Danube basin, and covers an area of approximately 1,390 km² with an average gradient of 1.2%. Just after Konjic, the Neretva widens again into a third and larger valley, which was a fertile agricultural plain before being submerged by the artificial reservoir of Lake Jablaničko, formed after the construction of the Jablanica dam.
The second section begins at the confluence of the Neretva and Rama rivers, between Konjic and Jablanica, where the Neretva makes an almost 180° turn to the east-southeast and then, after a short stretch, turns south again. From Jablanica, the Neretva enters its third and largest canyon, which cuts through the steep slopes of the Prenj, Čvrsnica and Čabulja mountains, with depths ranging from 800 to 1,200 metres. Three hydroelectric dams operate between Jablanica and Mostar.
When the Neretva widens for the second and last time, it begins its third section. This area is colloquially known as the "Bosnia and Herzegovina California" because of its Mediterranean climate and because it is an area of agriculture and wine-making. The last 30 kilometres of its course form a wide alluvial delta before the river flows into the Adriatic Sea.