Avon and Somerset Police in Bath are appealing for information to try to trace a man who exposed himself to a woman walker on the Cotswold Way path near Weston village.
It happened near Penn Hill, an area of long grass where a path leads past an old church and into a meadow, at around 2.30pm on Thursday 19th June.
The 54-year-old woman was shocked but not hurt.
She shouted at the man and walked on, and when she looked back he had disappeared.
He is described as white, in his late 20s, of slim build, 6ft tall, clean shaven with mousey brown short hair.
He was wearing beige or khaki shorts.
Anyone with any information is asked to call Bath police on 101 quoting crime reference number 66672/14.