Ground waters, springs, headwaters, creeks, rivulets, and mountain peat bogs represent the hydrogeographical potentials of the Nature Park.
Ground waters were formed in various types of aquifers. The most widespread and the richest type of aquifer is the one formed on crack-cavern porosity type terrains. These aquifers are mainly built of limestone complexes of Triassic age, and of volcanogenic-sediment rock complexes. Waters of these aquifers are mildly alkaline, of both groundwater and surface type, and suitable for water supply. There are aquifers in Mokra Gora that were formed on crack porosity type terrains. They do not have concentrated ground water flowing occurrences, but diffuse flows or springs of small productivity. Aquifers formed on terrains with intergranular porosity represent a special group. They are less productive and have a primary influence on enrichment of crack springs or on surface water supply.
Springs occur in the boundary zone of Šargan, Tara, and Viogor, as well as in river valleys, at the fold between the valley side and the valley bottom.
The waters of the valley of Mokra Gora flow into the Drina River basin, while the waters of the valley of Kremna flow into the Zapadna Morava River basin. The Šargan Mt. forms the watershed between these two basins.
The largest river of the valley of Mokra Gora is the Kamišna River, which springs below the southern slopes of Veliki Venac. Following 17,565 m of its flow, below Kotroman, it empties into the Beli Rzav River, which, after joining the Crni Rzav River, forms the Rzav River, which empties into the Drina River.
Below the village of Glibetići are the river mouths of two largest tributaries of the Kamišna River – Šargančica (2,322 m), which springs on the Šargan Mt. below Tabačka Kosa, and Postanjski Potok (4,951 m), which flows from Iver. Below Kotroman, before emptying into the Beli Rzav River, the Kamišna River receives the waters of the Krsmanski Potok creek. Of numerous smaller creeks that empty into the Kamišna River, the following should be mentioned – Dugančica, Smrdljivi Potok, Brezjak, Rakije, Crni Potok, and Dubošac.
The largest river of the valley of Kremna is the Bratešina River, with the Konjska Reka and the Užički Potok as the spring branches of the Đetinja River. The Đetinja River empties into the Zapadna Morava River.
Particular values of Mokra Gora and Kremna are the natural thermo-mineral springs – Bele Vode, Voda Sv. Jovana Krstitelja, Česma, Dulova Voda, the salt spring Radovanova Voda, the sulphur spring Glišova Voda, etc.