Graphical view of database links between databases

Hello!

In my new job i am responsible for an Oracle Database environment that has grown in the last years with lots of database links between databases.

Sadly, there is no documentation which database is connected to another database (or why).

I would like to document these links and create a graphical map of the links and databases.

I could use

SQL> select * from dba_db_links;

for every database.

Than create a map manually in a graphics tool like Microsoft Visio.

Possible, but would be very boring, time consuming and you have to do all things by hand and if anything changes, you have to change the map by hand again.