Rotorua is a city on the southern shores of the lake of the same name, in the Bay of Plenty Region of New Zealand's North Island. Located in the heart of the North Island, Rotorua is a major destination for both domestic and international tourists; the tourism industry is by far the largest industry in the district. It is known for its geothermal activity, and features geysers – notably the Pohutu Geyser at Whakarewarewa – and hot mud pools. This thermal activity is sourced to the Rotorua caldera, on which the town lies. Rotorua is home to the Waiariki Institute of Technology. The Lakes of Rotorua are a collection of many lakes surrounding Rotorua.