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A 250m-long crop circle of a jellyfish has appeared on farmland.

The owners of the land in Oxfordshire have urged visitors to stay away from the circle, which is also 60m (197ft) wide, to avoid further crop damage.

Sally Ann Spence and husband Bill, who own Berry Croft Farm near Ashbury, said hundreds of visitors have been trampling over their field.

They said it was "beautiful" but the flattened crops were now "useless" and the damage would cost about £600.

"We have not given permission for people to walk on our land," Mrs Spence said.

"The pattern has already cost a great deal of damage - possibly about £600.

"People can get a better view from the air."

She said she was not concerned about tracking down the culprits and the incident has not been reported to the police.

It is not the first time crop circles have appeared on their land, they said, but the jellyfish is one of the most spectacular.

Correction: Mrs Spence inadvertently provided a figure of £600,000, rather than £600, for the damage caused, which was used in an earlier version of this story.