za górami, za lasami

Etymology
lit. 'beyond [the] mountains, beyond [the] woods'.

Adverb

 * 1)  once upon a time
 * 2)  somewhere far away
 * 1)  somewhere far away

Usage notes
It is often extended and several additional words are added, e.g. “za górami, za lasami, za siedmioma dolinami” (lit. 'beyond the mountains, beyond the woods, beyond the seven valleys').