Earthsea is an immense archipelago of small and large islands, with most of the trappings of standard fantasy: magic, lonely towers, kings, wizards, and dragons.
It is a variant on the often-told tale of the mysterious stranger who arrives in a remote village, but with many original touches: for instance, the arrival of not just one mysterious stranger, but one at the start of the story and another at the end.
It is the most deliberately feminist tale of the five, telling the story of a young woman who is challenged by a male sorcerer to go to Roke and study at the school of magica privilege that at this time in Earthsea history is reserved for men.