Bogs Field. Behold Bogs Field, a wonder of the natural world where a greater number of unique mineral springs come to the surface than at any other place known on Earth! 36 of Harrogate's 88 mineral wells are found here, of which no two are alike. The waters are Magmatic or Plutonic in origin, having never existed as rain, and have flowed deep beneath the Earth for 20,000 years before surfacing in vertical shafts in the strata . Known in C15 as Sauerkeld or Sour Springs, Bogs Field was investigated and developed by the Victorians who piped the mineral waters to the Royal Bath Hospital and to the Pump Rooms and Baths of Low Harrogate.