The water visible fills the remains of the earthworks dug around the central Motte of Anstey Castle. The castle was owned by Henry III in 1225. See http://www.castleuk.net/castle_lists_east_anglia/167/ansteycastle.htm
Uploaded to Geograph by Bikeboy on 25 March 2016
Photo © Bikeboy, 25 March 2016. Licensed for reuse under this Creative Commons licence