What is the setting of The Floating Island by Elizabeth Haydon?

The novel is set in several key areas, all of which occur in the Great Overworld, or above ground. The Nain race commonly live in Castenen, underground, but Ven and his family live in Vaarn, a city positioned right on the edge of the sea, where not many Nain choose to live. Vaarn is a sailors city, and the Nain generally dislike water. Ven, however, enjoys the sea, and on his travels, he visits many places in the Overworld. His travels lead him into the ocean, where he learns there are entire kingdoms under the water. He also visits the Floating Island, a place of magic and intrigue where the winds blow from all areas of the world, allowing one to send messages through the air. Ven also visits Serendair, a large island that serves as home to many races. Here, he stays in the town of Kingston, which is a port city, filled with races of all kinds, and shops of all kinds. Ven and his friend, Char, stay at the Crossroads Inn, where much of the book takes place. The inn is a home for many orphans, provided by Gertrude Snodgrass. The Inn is lovely, but haunted by an ancient spirit that Ven and his friends help put to rest. Near the Inn is the graveyard, where Gregory Snodgrass, Gertrude's son, is buried. In addition, Ven spends some time in Castle Elysian, in the dungeon and speaking with the King.