It then flows through the Zhytomyr and Rivne oblasts, and briefly along the Ukrainian-Belarusian border before finally emptying into the Horyn.

[2][3][1][4] Cities and towns located on the Sluch river include: Zviahel, Berezne, and Sarny.

Large settlements on the Cases: Krasilov, Starokonstantinov, Lyubar, Miropol, Pershotravensk, Baranovka, Rogachev, Zviahel, Berezne, Sarny.

According to the Red Data Book of Ukraine, the conservation status of the ichthyofauna of the river is ordinary Leuciscus leuciscus, Linnaeus, Carassius carassius, Linnaeus and Lota lota, Linnaeus in the vulnerable category, as well as Russian albino (Alburnoides rossicus, Berg, 1924), lobster gulls (Eupallasella percnurus, Pallas, 1814), Drenier's Marsh (Barbus borysthenicus, Dybowski, 1862), Gymnochepus acerinus, Gueldenstaedt, 1774, Ukrainian Minogue (Eudontomyzon mariae, Berg, 1931) in the category fading The most numerous species are pike, gossip, redhead, verkhovka, ploskryk, beetle, wild boar, perch.

Along the river bank in Zhytomyr oblast, on the 120th kilometer, there is the Novograd-Volynskyi "Stalin Line", built in 1932–1939.