This is the 7973rd most frequent Swedish word.
vättern
Vättern: A large lake in southern Sweden, the country's second-largest lake.
Here, 'Vättern' is used as a proper noun referring to a geographical entity, specifically a lake.
Vättern är Sveriges näst största sjö.
Vättern is Sweden's second largest lake.
In this sentence, 'Vättern' again refers to the lake, but the context is its surrounding region, emphasizing its role as part of the planned route.
Vi ska åka runt Vättern på vår cykeltur.
We will cycle around Vättern during our bike trip.
Here, 'Vättern' is in the context of location, indicating proximity to the lake where an activity takes place.