The Municipality of Mojkovac encompasses the extended Tara River valley, which divides the area of the municipality into approximately two equal parts. The Tara valley is a composite character: the gorges, basins and parts of the canyon are scattered. From the gorge, which is located north of the mouth of the Štitarička River, there is a Mojkovac valley, which passes from the Feratovo Polje, through Podbišće, Donje Selo and Mojkovac to the ravine of the Upper and Lower Polje. The total length of the basin is , and the width is . In the canyon part of Tara, which belongs to the municipality of Mojkovac, larger extensions are around the mouth of Bistrica, Ravnik () and around Gornja Dobrilovina and black black pine forest in Crni Podim. Four kilometers north of Mojkovac is the passage of the Strait (), through which it enters the expanded and well populated Leposnica Valley, the tributaries of Lim.