What is Russian equivalent of a county?

There isn't a direct equivalent of a "county" in Russia, as the administrative structure is different. However, depending on what aspect of a county you're looking for, the closest equivalents would be:

For administrative purposes:

* Район (rayon): This is the closest equivalent to a county in terms of administrative division. It's a subdivision of an oblast (region) or a republic, and has its own administration.

* Городской округ (urban district): For cities and towns with their own independent administration, this is a similar concept to a county.

For geographical purposes:

* Уезд (uez): This is a historical term for a geographical region that roughly corresponds to a county, but it's no longer used in modern Russia.

For cultural or historical purposes:

* Губерния (gubernia): This was a historical administrative unit similar to a province or a state, and sometimes encompassed multiple counties.

It's important to understand that the Russian administrative structure is complex and varies from region to region. Always consider the specific context when trying to find a Russian equivalent for a county.