the river and more lakes scattered across the mountains of Treskavica and Zelengora in the wider area, mountains, peaks and forests, flora and fauna of the area. The Upper Neretva has water of Class I purity and is almost certainly the coldest river water in the world, often as low as 7–8 degrees Celsius in the summer months. Rising from the base of the Zelengora and Lebršnik Mountain, Neretva headwaters run in undisturbed rapids and waterfalls, carving steep gorges reaching in depth. Rakitnica River The Rakitnica is the main tributary of the first section (). The Rakitnica River forms a long canyon, out of its length, that stretches between Bjelašnica and Visočica to the southeast from Sarajevo. From the canyon, a hiking trail along the ridge of the Rakitnica canyon drops 800 m below, to the famous village of Lukomir. The village is the only remaining traditional semi-nomadic Bosniak mountain village in Bosnia and Herzegovina. At almost 1,500 m, Lukomir features stone homes with cherry-wood roof tiles. It is the country's highest and most isolated mountain village. The village is inaccessible from the first snows in December until late April and sometimes even later, except by skis or on foot. Middle Neretva Hydrographically the Middle Neretva section begins from town of Konjic, but after the construction of Jablanica Hydroelectric Power Station and flooding of large fertile valley between Konjic and Jablanica, known simply as "Neretva" since Middle Ages, the new point for hydrographical division became dam of the Jablanica HPP where also is a place of confluence of the rivers Neretva and Rama. Here the Neretva river suddenly takes almost 180° degrees turn toward east-southeast and flows the short leg before it reach town of Jablanica. From this point it turns again toward south and enters third and the largest canyon on its course, running through the steep slopes of the mountains of Prenj, Čvrsnica and Čabulja, reaching between in depth. 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,