Kuala Selangor Is One Of The Few Places In The World Where Visitors Can Watch The Synchronized Flashing Of The Fireflies. When The Sun Goes Down At Kuala Selangor, Twinkling Fireflies Light Up The Berembang Trees Along The Selangor River. Experience The Natural Display On A 6-7-Hour Tour From Kuala Lumpur That Includes Round-Trip Transport From Your Centrally-Located Hotel. Hotel Pick-Up & Drop-Off Included.