This is the 27th most frequent Finnish word.
suomessa
"In Finland."
Here, 'Suomessa' indicates the location where an activity (living) takes place using the inessive case ending -ssa, meaning 'in Finland'.
Asun Suomessa.
I live in Finland.
'Suomessa' conveys the place (Finland) the event will occur, again utilizing the inessive case -ssa to express 'in'.
Tapahtuma järjestetään Suomessa ensi viikolla.
The event is held in Finland next week.
In this sentence, 'Suomessa' specifies a location (Finland) where the described condition (having beautiful nature) is observed, also employing the inessive case.