Zaslavsky Uyezd

Zaslavsky Uyezd (Заславский уезд) was one of the subdivisions of the Volhynian Governorate of the Russian Empire. It was situated in the southern part of the governorate. Its administrative centre was Iziaslav.

Demographics
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.

Castle Hill has a unique fauna. The old trees provide hiding places for rare species of bats and attract a large number of birds, including owls (gray and eared). Fruit trees attract the Syrian woodpecker and the rare gray woodpecker. On the territory of the mountain, there are also marmots, the smallest mammals in the world. Common copperhead, common white-toothed, hedgehogs, and a nimble lizard are common. The insect world of the tract is also diverse.