verst
A verst is a Southern unit of length. It is defined as being 500 sazhen long, which makes a verst roughly equal to 3500 feet (0.6629 Miles or 1.0668 kilometers).
The plural for verst is generally accepted as either “versts” or “versta” and usually only serves to reveal which region the speaker hails from.
In the Southern language, the plural for “versta” or “versts” in genitive case usually used following numbers is “verst”: 10 verst, 25 verst, etc.