Standard word for an island. Can also refer to an isolated area or a territory in certain contexts.
Japan is a country made up of many islands.
Rare animals live on that island.
Slang term for a person's or group's territory, especially in contexts like sex work or organized crime. Usually written in katakana as シマ.
This area is that gang's turf.
She does business on her own territory.
He lives on a small island.
If you encroach on another gang's turf, it leads to trouble.
We went sightseeing, crossing between islands by boat.
The gang members moved to protect their turf.