Dan Reeves, HR information adviser & International History project administrator from the Department of Human Resources and International History.
Nature's borders of Earth, Wind and 'Fire Water', Wai-O-Tapu geothermal 'Champaign Pool', North Island New Zealand. Earth borders of solid Arsenic, mineral Gold and Silver, against a wind of bubbling Carbon Dioxide; set in thermal 'fire Water' at 230 degrees centigrade. Not a border to be crossed!