This is the 7963rd most frequent Russian word.
колыму
"Колыму" is the accusative form of "Колыма," referring to the Kolyma region in Russia, often associated with harsh labor camps during the Soviet era.
The word "колыму" is used here in the proper form as the accusative case of "Колыма" to indicate direction to the location.
Он отправился на Колыму работать.
He went to Kolyma to work.
"Колыму" in this sentence is used in a prepositional context, indicating destination in a discussion.
Мы обсуждали поездку на Колыму.
We discussed a trip to Kolyma.
Here, "Колыму" is part of a phrase specifying the topic of the story, showcasing an associative context.