The varioref package
varioref package, Frank G. Mittelbach · 2016
This package defines the commands \vref, \vpageref, \vrefrange, and \vpagerefrange for LTEX 2e. \vref is similar to \ref but adds an additional page reference, like ‘on the facing page’ or ‘on page 27’ whenever the corresponding \label is not on the same page. The command \vpageref is a variation to \pageref with a similar functionality. The \v...range commands take two labels as arguments and produce strings which depend on whether or not these labels fall onto a single page or on different pages. Generated strings are customizable so that these commands are usable with various languages.