Arvandor is the name given to the Lost Kingdom of the Undersea, which withdrew from the surface world and sunk beneath the waves over 500 years ago.
Its reemergence 9 months ago caused quite the stir as word spread of dazzling architecture and advanced technology the likes of which the Realms had never seen.
The kingdom is populated with a variety of species, from a variety of merfolk and sea elves. The traditional rulers are generally Merrow.