Verst

A verst (верста, versta) is an obsolete Russian unit of length defined as 500 sazhen. This makes a verst equal to 1.0668 km.

Plurals and variants
In the English language, verst is singular with the normal plural versts. In Russian, the nominative singular is versta, but the form usually used with numbers is the genitive plural verst – 10 verst, 25 verst, etc. – whence the English form.

A mezhevaya versta (межевая верста, literally 'border verst') is twice as long as a verst.

"The verst of the 17th century was 700 sazhens or 1.49 km as against the 500 sazhens or 1.067 km it became at the time of Peter the Great."

Finnish virsta
In Finland, a virsta was 1,068.84 m according to the Swedish standard, defined in 1827 as of a peninkulma, the Finnish language name for the pre-metric Swedish mil, used in Finland since the early 17th century (see Obsolete Finnish units of measurement), or 600 syli (Swedish fathoms, 1.781 m). Metrication replaced virsta with the kilometre in the 1880s.