The body of a climber has been found after an accident in mid Canterbury.

A person activated a personal locator beacon on Mt Harper about 4.30pm yesterday after their partner did not return from a day climbing trip, said Constable Philip Simmonds​.

A rescue helicopter flew around the area where the person had been.

"The rescue helicopter observed a body believed to be the person missing, however, due to the location was unable to access it," said Simmonds.

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"It appears the person has fallen a considerable distance."

The person who activated the beacon is reportedly uninjured and was flown back to town.

Rescuers will try to recover the body today.