Tonga, located in the Central South Pacific Ocean, is an archipelago consisting of four clusters of 172 coral and volcanic islands, with a total area of 747 square kilometers (sq km). Tonga is vulnerable to annual climate variability caused by the El Niño Southern Oscillation (ENSO) in the southeast Pacific. It brings prolonged drought conditions that deplete potable water and tropical cyclones during the wet season. The country’s vulnerability is exacerbated by its high dependence on climate-sensitive sectors, such as agriculture, fisheries, and tourism.