The woman is white, about 5ft 4in tall, 18 to 22-years-old, of large build and has black-dyed hair above the shoulder.
She was found at 10am on Monday morning and was wearing a black hoodie with ‘Lonsdale’ in bright pink writing across the front, blue jeans and black Nike trainers with fluorescent green/yellow thick laces.
Police said the death was ‘unexplained’.
They believe the woman may have been sleeping rough in a tent at a nearby barn.
If you have any information call detective inspector Deborah Goff via the Thames Valley Police Enquiry Centre on 101.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org