This is the 130th most frequent Lithuanian word.
lietuva
Lithuania.
Here, "Lietuva" is used as a proper noun representing the name of the country Lithuania.
Lietuva yra graži Baltijos šalis.
Lithuania is a beautiful Baltic country.
In this sentence, "Lietuvą" is the accusative form of "Lietuva," indicating the direct object of the verb "traveling."
Aš keliauju į Lietuvą šią vasarą.
I am traveling to Lithuania this summer.
Here, "Lietuvos" is the genitive form of "Lietuva," specifying the possession or relation to the country Lithuania.