When one talks about Latebra, they most certainly will be talk about the main plane, the culmination of many different laws and concepts. The "Planes" are the smaller metaphysical parts that add together to build what is known as the material plane, but 8 other planes, differentiated into 2 categories, are the building stone for said plane. Despite decent efforts to better understand the planes, little progress has been made due to the dangerous state of the world. Of all the powers on Latebra, the magical powerhouse, the Union, has seemingly the broadest knowledge regarding them.
The elemental planes
Also known as the inner planes, they each harbor a part of the material balance of the material plane. They are all connected and have traces of the other neighboring planes and interestingly enough more pronounced influences from their "opposite" planes, but either way they are still extremely "themed".
Also known as the outer planes, they each harbor Parts of the laws that govern existence, though skewed a little due to the imbalance of the Divine on Latebra.
Apart from that there are also the Astral, the Aether and the Aetherveil, all intrinsically linked and often mistakes as one, mainly by the uneducated.
While the astral can be likened to "home", the Aether to "door" and the Aetherveil to "walls" this is a very simplistic view. The Astral sea is furthermore the place where the Aetherial mainly roam.