This is the 818th most frequent Ukrainian word.
моря
"Моря" in English means "seas" (plural of "sea").
In this sentence, 'моря' is singular genitive case, denoting the destination or possessive aspect of the noun 'sea'.
Ми їздимо до моря кожного літа.
We go to the sea every summer.
Here, 'морів' is the plural genitive case form, emphasizing multiple seas as part of the description.
Я пам’ятаю шум відомих морів.
I remember the sound of famous seas.
In this context, 'моря' is used in the singular genitive case to indicate ownership or source of the water of the sea.