The Nautilus manual shows a pathname.
www.linuxselfhelp.com/.../nautilus.html

Nautilus is a file manager and more. It is also a browser and an ftp client. If
you don't have any location bar then you aren't in the browser. You can launch
it from the terminal by typing nautilus --no-desktop --browser. In the browser
you get a path just above the main file display window. You can change it from
icons to text mode by clicking on the icon at the left which shows a text editor
graphic. In text mode you will see the full path name and in the icon mode you
only see the icons of your location like home or Desktop.

If you don't have the browser launch when you start Nautilus you can make a
launcher for it with the above command or edit your menu to reflect the change
you want to make.