This is the 153rd most frequent Latvian word.
igaunijā
"In Estonia."
This sentence uses 'Igaunijā' to indicate location. It is in its locative case to express being in Estonia.
Es biju Igaunijā pagājušajā vasarā.
I was in Estonia last summer.
Here, 'Igaunijā' is again in the locative case, showing the location a person might have visited.
Vai tu kādreiz esi bijis Igaunijā?
Have you ever been to Estonia?
'Igaunijā' is used locatively to describe where an event took place, in this instance, an excursion.