Lobnica originates on the marshy, eastern Pohorje plateau, near Tiho Jezero (Falski Ribnik), below Bajgot peak. Major tributaries in the upper course include Črnava, Piklerica, and Kraljiščica, which flow in before Bajgot, after which the Lobnica enters a forest reserve (the primeval forest of Šumik). Up to Treh žebljev (Three Nails), its steepness is gentle and meanders. The steepness increases somewhat from Treh žebljev to Bajgot, and significantly in the area where it flows through the primeval forest. There, it creates numerous rapids and waterfalls, including Veliki and Mali Šumik Waterfalls. From its source to the lower boundary of the primeval forest, the Lobnica flows over tonalite, while in the lower course it crosses layers of gneiss, amphibolite, and schist. In the narrow valley up to Smolnik, the Lobnica reaches the plain and, after a few kilometers, flows into the Drava River.

Na Lobnici so delovali mlini in žage, ki so zdaj vsi že opuščeni.

In order to bring wood into the valley, the longest Pohorje water log flume ran along the Lobnica valley, 17 km long. In the literature, the log flume near Lobnica is also referred to as “Ruše Log Flume” or “water brook on Smolnik near Ruše.” It was built along the Lobnica stream with a length of 5,728 m already in 1874. A few years later, its extension was built from Bajgot via the Šumik waterfall, where one branch leads to Lahova Zaga and the other to Piklerica. It was built in 1901 with a total length of 11,664 m. It can be seen from older sources that the last length with all branches was 16,000 m. It was created on the initiative of the Ruše glassmaker Benedikt Vivat and served the needs of glassmakers for many years.