A lake in South Yorkshire has become home to thousands of tropical jellyfish.

The Regent's Park jellyfish have appeared in the landlocked Hatfield Water Park in Doncaster.

The town's council is baffled as to how the harmless creatures have got into the lake, and is appealing for other sightings to be reported.

The jellyfish are around 2cm long and are originally from the River Amazon.

We are mystified as to how they got here

Colin Howes Doncaster Council

Colin Howes, from Doncaster Council's museum service, said: "The park is the most northernly site for the jellyfish ever to be found.

"However, as the marina is not connected to any other body of water, we are mystified as to how they got here.

"Anyone visiting the park should easily be able to see the jellyfish with the naked eye, and can rest assured that they are harmless."

The 370-metre-long lake was created in the 1970s from a quarry used to extract sand.

An angler first saw the jellyfish, also known as craspedacusta sowerbyi, at the beginning of August.

The council's museum service is urging anyone who sees the jellyfish in water in the Yorkshire area, to get in touch.