Radiant Meadows is a location that first appeared in Dragons: Rise of Berk.
Radiant Meadows appears to be comprised mainly of sea stacks, with one central pedestal-like stack. Three smaller and shorter stacks surround the central one. They have purple and glowing blue corals decorating the sides and tops of the stacks, as well as grass and a few evergreen trees.
The Radiant Meadows location was released in February 2019, ahead of the US release of How to Train Your Dragon: The Hidden World. This is a base point for the Light Fury to go on searches, similar to Toothless' searches in the game.