The third, relatively loose, faction of The Expanse universe is called the Outer Planets Alliance. It's members are Belters, who live on asteroids like Ceres and Eros, as well as a number of space stations on both sides of the asteroid field.
However, are there any actual "planets" in the OPA? I know that the outer planets are uninhabitable (sans Pluto) due to being gas giants, but their moons are not.
Are there any moons where people live? Not just work, live, like on Ceres.
Please refrain from book spoilers - if there is are locations like that described in the books that haven't been shown in the TV show, please mention them without any context.