The three gates on the south side (Ezek 48:33-48:33)

“On the south side,

It shall be  

Four thousand five hundred cubits

By measure.

The three gates are

The gate of Simeon,

The gate of Issachar,

The gate of Zebulun.”

On the south side, three lesser known tribes had gates. Simeon had very few people, while Issachar and Zebulun were small northern territories.