This is the 7242nd most frequent Russian word.
владивостока
"Vladivostoka" is the genitive case of "Владивосток" (Vladivostok), meaning "of Vladivostok," a city in Russia.
The word 'Владивосток' is the name of a city. Used in the base nominative case here as the destination.
Я мечтаю поехать в Владивосток и узнать его достопримечательности.
I dream of going to Vladivostok and exploring its attractions.
Here, 'Владивостока' is in the genitive case, used to indicate movement from the city.
Мой друг переехал из Владивостока в Москву.
My friend moved from Vladivostok to Moscow.
'Владивостока' in genitive case, indicating possession or association with the ecological problems.