The Hell's Gate Geothermal Park is the most active geothermal reserve in Rotorua Rotorua. It covers more than 20 hectares and has a natural geothermal landscape trail of 2.5 kilometers. The protected area has a rich geothermal landscape, hot air jet holes and a heat wave tumbling mud pool. It seems to be the place where the orcs are produced in the "Lord of the Rings" movies, where jet holes, hot water lakes, sulfur crystals and sediments are everywhere.