I am actually more interested in the location he got these shots as well as the length required. It seems like need 1200mm to shoot from a boat near some swamp or something.
No need 1200mm lah. The place is in Langkawi itself & is accessible by motor boat - RM200 per hour (it's one of the tourist hotspots so it's hard to miss)
Usually, a 200 to 300mm lens will do.