"...house was almost destroyed, but I got him out all right before the Muggles started swarmin' around. He fell asleep as we was flyin' over Bristol."
-- Hagrid (PS1)
Bristol is a seaside city (and county) located in southwestern England near Chipping Sodbury, where Rowling grew up. Hagrid flew the motorcycle over this city on his way to Privet Drive, at which time baby Harry fell asleep (PS1).
Location: Map of Wizarding Britain