Enter Therah'nYopah

Therah has lush green forests stood to cover every stretch of land densely, leaving few scattered clearings in which small obsolete towns could be built. 

Within it's core, resides a hidden world called Yopah. This world housed a face full of pure, fresh water as far and as bottomless as one might imagine. On land, of which they have precious little, stand advanced cities made of glass.