What are the seven earths in Mesopotamian religion?

No I am not asking about in Islam

https://en.wikipedia.org/wiki/Seven_heavens

In general, the heavens is not a place for humans in Mesopotamian religion. As Gilgamesh says to his friend Enkidu, in the Epic of Gilgamesh: "Who can go up to the heavens, my friend? Only the gods dwell with Shamash forever". Along with the idea of seven heavens, the idea of three heavens was also common in ancient Mesopotamia.