Zaslavsky Uyezd (Заславский уезд) was one of the subdivisions of the Volhynian Governorate of the Russian Empire.
At the time of the Russian Empire Census of 1897, Zaslavsky Uyezd had a population of 208,742.
Of these, 76.9% spoke Ukrainian, 13.3% Yiddish, 7.0% Polish, 1.8% Russian, 0.8% German and 0.2% Czech as their native language.
The old trees provide hiding places for rare species of bats and attract a large number of birds, including owls (gray and eared).
On the territory of the mountain, there are also marmots, the smallest mammals in the world.