St Nelle - A Revelation

Saint Nelle cannot exist anywhere in our world. The city is too unlikely, and there are not enough fuzzy, poorly-understood regions in our world to support a city of such size without it coming under more direct scrutiny.

 The city is very unlikely, and the more consensus reality closed in on itself, the less room there was for St Nelle. In the end it was not even a legend--it vanished utterly from the world, disappearing even as an idea.

 Where did it go?