Mandy Edwards belongs to the School of Earth, Atmospheric and Environmental Sciences of the University of Manchester, and she claims..."The [iron] sphere could have actually been produced by a natural occurrence known as concretion, which is caused by the “precipitation of natural mineral cement within the spaces between sediment grains”."

It's in Bosnia. Alternatively, the article quotes Dr Sam Osmangich, a proponent of the theory that an "ancient civilisation that was once present here, dating back more than 1,500 years."