What is "lulunga"

Lulunga is an island group and a district in Haʻapai administrative division of the Kingdom of Tonga. The archipelago consists of 17 islands, only 5 of which are inhabited. These are Haʻafeva, Matuku, Kotu, ʻOʻua and Tungua. The population of the whole island chain is nearly 500, most of whom live on Haʻafeva.