This is the 271st most frequent Estonian word.
narva
"Narva" is a proper noun referring to a city in Estonia.
Here, 'Narva' is a proper noun, referring to a specific city.
Narva on linn Eestis.
Narva is a city in Estonia.
Here, 'Narva' is part of the compound proper noun 'Narva jõgi' (the Narva River), maintaining its role as a proper noun.
Narva jõgi on piiriäärne jõgi.
The Narva River is a border river.
In this case, 'Narvat' is the partitive case of Narva, indicating the destination or object of the visit.