Where in the Linux system is information about current mount points of file systems usually located?

In Linux, information about current filesystem mount points is usually stored in the /proc/mounts file. This file contains a list of all mounted filesystems at the moment, including devices, mount points, filesystem types, and mount options.

The /etc/mtab file is also often used, which traditionally contained information about mounts, but in modern systems, it may be a symbolic link to /proc/mounts.

To view the mount points, you can use the command:

cat /proc/mounts

or

mount

which displays the current mounts in a human-readable format.