This is the 280th most frequent Swedish word.
sundsvall
"Sundsvall" is a proper noun and refers to a city in central Sweden.
'Sundsvall' is used as a proper noun here referring to a specific city.
Jag bor i Sundsvall, en stad i norra Sverige.
I live in Sundsvall, a city in northern Sweden.
Here, 'Sundsvall' is again a proper noun indicating the location to be visited.
Vi planerar att besöka Sundsvall under sommaren.
We plan to visit Sundsvall during summer.
In this sentence, 'Sundsvall' is used as the name of the city, highlighting its cultural feature.