I'm having a hard time making my current project, a weird sci-fantasy setting. It's in the same category as "Ultraviolet Grasslands", "The Electrum Archive", & "Vaults of Vaarn", but its most prominent features are an iridescent river & a titan's corpse. Doesn't quite roll off the tongue and doesn't abbreviate nearly as well as "UVG".
I tried Opal River, but that's apparently a real thing already associated with kayaking.