What is the setting in the novel, Dragonfield?

Yolen is a master of creating vivid, magical settings for her stories. From mysterious woodlands in which an even more mysterious unicorn lives to a bustling city soon to be destroyed in which the youngster Merlin learns about human nature, Yolen creates places that linger in the mind long after the story has been read. The village, islands, river, and marsh of "Dragonfield" combine to form a place that seems real, that is memorable for what it is as well as for the fantastic adventure that takes place there.