Ejuxria (Hartley Coleridge, paracosm)

Somewhere along the way, Hartley conceived the idea of an underground stream of water that would eventually erupt onto the surface, eventually creating a mighty river that would soon attract merchants and land developers, leading to the formation of a new island-continent. He called this imaginary paracosm Ejuxria, and laid out its geography and history with great care, explaining everything to Derwent as he went along. Derwent believed that Hartley kept up Ejuxria into adulthood.[6][7]

Source: Hartley Coleridge – Wikipedia