What is the setting of The Blue Sword by Robin McKinley?

The novel is set in a mythical world, and through the novel, the characters move through a variety of different landscapes. Harry begins her life in Home, which is an area of lush green forests, jungles, and grasslands. Following her father's death, she is shipped to a town called Istan, located at the edge of the great northern desert on the peninsula continent of Daria. At the outer edge of Istan is the Outlander military fort of General Mundy, where Richard, Harry's brother, is enlisted. Istan is situated in a desert, with searing heat and very little vegetation. There are no seasons, as there are in Home, but there is a short rainy period, after which everything grows rapidly, but dies quickly, as well. Beyond Istan to the north and east are the Ossander mountains, where the Hillfolk live with their King, Corlath. These native individuals call the kingdom Damar. Within the mountains is Ritgar's Gap, which is a passage that stems from the Northern territory through the mountains to Istan. Within Damar lies The City, which is the home of Corlath and his people. The City is made nearly entirely of stone, and within the City is a lovely guest area where Harry spends much of her time in the city. To the north of the city, within the mountains, is a lush jungle and forest, in which Luthe, the oracle, lives, and where Harry and Corlath visit often later in their lives.