fedora is managed by
lvm. It basically allows you to take a physical partition and assign parts of it to logical
lvm partitions as needed, making space allocation more flexible. To learn more, you can read the arch linux wiki entry, for example.
The tool you are using,
gparted is not displaying the
You can do so by running
lvdisplay (list logical volumes) and
pvdisplay (list physical volumes). The lvm management tools are documented for example in the redhat docs.
Or you can use a graphical tool that properly supports
lvm (for example:
KDE partition manager)