 The Isle of Echoes is a small island made entirely of bluestone and situated in the Western Sea, ten days sail from Silvertown and thirty from Southport on the Purple Plains.It is the home of the Echorium and the Singers, and therefore one of the most important locations in the series.The island is the setting for the beginning and ending of every novel except "Dark Quetzal" (which begins on the Isle, but ends on the Purple Plains).