Kauri gum (/koʊˈri/) is a fossilised resin extracted from kauri trees (Agathis australis), which is made into crafts such as jewellery. Kauri forests once covered much of the North Island of New Zealand, before the arrival of people caused deforestation, causing several areas to revert to sand dunes, scrubs, and swamps. Even afterward, ancient kauri fields continued to provide a source for the gum and the remaining forests.