Police are investigating after a woman was found dead at the bottom of Baitings Dam near Ripponden.
Detectives were called to the area at 10.30am today.
They say the woman is aged between 40 and 70.
Anyone with information should call Calderdale CID on 0845 6060606.
Information can also be passed anonymously to CrimeStoppers on 0800 555111.