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 genitive plural verst — 10 verst, 25 verst, etc. — whence the English form.
A mezhevaya versta (Russian: межевая верста, lit. border verst) is twice as long as a verst.
In Finland, virsta was originally 1.069 km according to the Swedish standard, but the Russian verst (1.0668 km) replaced it after annexation to the Russian Empire in 1809. Virsta was originally 600 sylis (fathoms, 1.781 m), but then changed to 500 syli, since the Russian syli was longer, 2.134 m. A derived unit was peninkulma = 10 virsta (see Finnish units of measurement). Metrification replaced virsta with the kilometre in the 1880s.
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