Places Subterranea First named in The Yellow Knight of Oz, ch. 7 "You are in Subterranea." Appearances The Yellow Knight of Oz (7 of 20 chapters) 7 THE CRUISE OF THE SKYROCKET8 A GOLDEN PRINCESS13 KING OF THE QUIX!14 THE ENCHANTED FOREST15 FIVE TRAVELLERS MEET17 THE RESTORATION OF CORUMBIA20 THE MARRIAGE OF MARYGOLDEN Seen here Marygolden 1