Kuala Selangor Firefly Cruise

On the Selangor River near the small town of Kuala Selangor, hundreds of thousands of Pteroptyx tener fireflies inhabit the riverside berembang trees and synchronise their bioluminescent flashing in a phenomenon found in only a handful of rivers worldwide. Boat cruises at dusk navigate between glowing riverbanks in an experience that visitors consistently describe as magical and otherworldly.