This is the 7803rd most frequent Russian word.
исландия
Iceland.
The word 'Исландия' is used as the name of the country Iceland in a geographical context.
Исландия находится на северо-западе Европы.
Iceland is located in the northwest of Europe.
'Исландию' (accusative case) here denotes the object of the verb 'посетить' (to visit).
Я мечтаю посетить Исландию и увидеть её природу.
I dream of visiting Iceland and seeing its nature.
'Исландии' (dative case) is used to indicate the indirect beneficiary of the knowledge gained.