The first one is a physical division, where regions with similar characteristics, from a point of view of topography, vegetation and climate, are grouped together.
(The first one; is; a physical division, where regions with similar characteristics, from a point of view of topography, vegetation and climate, are grouped together) (regions with similar characteristics; are grouped together; L:a physical division)
The first one regions with similar characteristics
is are grouped together
a physical division, where regions with similar characteristics, from a point of view of topography, vegetation and climate, are grouped together
L:a physical division