The River Ray is a river in Buckinghamshire and Oxfordshire, England. It rises at Quainton Hill and flows west through a flat countryside for around 25 km or 15 miles. It passes the village of Ambrosden and then flows through Otmoor. It joins the River Cherwell near Islip.
In 1815 a new channel was cut between Charlton-on-Otmoor and Oddington, known as the New River Ray, to divert much of the water flow around the northern and western edge of Otmoor.
The New River Ray at Oddington
The River Ray at Charlton on Otmoor