Police are searching for a sex offender following a disturbing incident at a beach near the Twelve Apostles.

The victim was sunbathing at the isolated Massacre Bay about 3pm last Thursday afternoon when she saw a man performing a “lewd act”.

He then approached her, raising his arms as he did so.

The woman ran, climbing up a cliff face some three storeys high to escape.

She saw the man walk up and down the beach before losing sight of him.

Police have today released an image of the suspect as well as a distinctive tattoo he may have (pictured above).

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au