The Norfolk Broads are a series of shallow lakes and wetlands in the countryside around Norwich. The largest broads are Hickling Broad and Barton Broad. The lakes are linked by the Bure and Yare rivers and smaller rivers, canals and dykes. This network of waterways makes a labyrinth of navigable water well-known as a suitable training ground for new sailors, in Ransome's time and today. The County of Norfolk is a low-lying county in the east of England and on the North Sea. Norwich is the administrative centre and main city.