Yama

Yama (山, meaning "mountains" in English) is a chain of mountains really high that is very hard to cross. It's located to the north of the main island, above the Thunder Meadow.

There had been mines next to the mountains for a while but recently, they've expended so that the village of Yama No Mura had to relocate.

There are still a few villages in the mountains, mostly earth and fire benders.

There is no technology and people live thanks to hunting and cultures.

Yama No Mura
The village of Yama No Mura (山の村, meaning "village of the mountains" in English) was the biggest one. However, the mines grew when Mahō No Aki grew as well and the villagers had to leave because the air was too polluted.