Not sure how to translate this:  dolunayda yedi denizi yuregime sigdirirm

Isn´t dolunaya "full moon"? But what is the "ada" at the end? In the full moon?  On the full moon?  I´m confused.

Thanks for any help!

I fit seven seas in my heart on the full moon.

Correct, -da is like in, at, or even on.

I am at home - Ben evdeyim

He lives in Boston - O Boston´da yaşıyor

It´s on the table - O masada

This link is a good reference for the main Suffixes in Turkish. This one is (4).

http://www.turkishlanguage.co.uk/suffix.htm

Teşekkur

Translating it as "on the full moon" or "at the full moon" how should this sentence be interpreted? Meaning there´s a full moon out at night? Or something is on the full moon?

It should be translated as "under the full moon". That´s actually what it means. For some reason, we rarely say "dolunay altında"; we prefer "dolunayda".

(Altında=under)

Hope it was helpful,

-Jansay