YOU have never heard of it, but this is Rainbow Valley, Drybrook.
Described by its backers as a "dream scenario", it is, in fact, Drybrook Quarry.
The remarkable scheme was unveiled in Ruardean on Monday evening at the home of Ruardean parish council chairman Vicki Meek.
It is seen as a viable alternative to further quarry expansion plans.
The parish council is seeking support for the scheme and is to ask the quarry's owner, Lord Hanson, for a meeting to discuss the idea.
"It is the Forest of Dean's very own Eden Project. Should the viability of these proposals find the support of Lord Hanson a colossal step will have been taken to regenerate and enhance the Forest," said a spokesman.
The meeting was attended by county and district councillors, members of the regeneration team, businessmen and others living close to the quarry.
The parish council believes the quarry plan provides a serious alternative to what they describe as "environmentally unfriendly and non-viable proposals to extend Drybrook Quarry westwards."
They offer the "dream scenario" of transforming the vast crater into a spectacular landscape with a huge waterfall and lagoon beneath a glass dome. It would be a "summer in mid-winter facility" which would be at the frontier of science, ecology and conservation.
The plan, say the sponsors, offers huge opportunities with woodland terracing and rail links to a nearby old gold mine as well as combining visits to adjoining farmland promoting the excellence of countryside produce.
They say the quarry offered a unique opportunity to provide a major year-round attraction with both outdoor and solar heated indoor facilities and even vast and hidden parking for hundreds of visitors.
Initial funding to push the plan forward could come from the Coalfields Regeneration Fund as both Ruardean and Drybrook are within the Cinderford local planning area, they say.