Fiji is a country in the South Pacific.
Criminal China White once used one of the Fiji islands as the base of operations for her heroin distribution. Many years ago, Oliver Queen was stranded on the island and exposed China's cartel. This is how he became the Green Arrow.
It was also one of many places invaded during the great Invasion. The Khunds used it as one of their strategic points for an attack on humanity, and they were defeated by Justice League International and Wonder Woman.