The estuary of the Krabi river is listed as Ramsar wetland number 1100 since July 5 2001. The protected area of 213 km² covers more than 100 km² of mangrove forests and 12 km² of up to 2 km wide tidal mudflats. The area is popular with birdwatchers coming to spot some of the most diverse and rare species in the world, the Masked Finfoot and the Brown Winged Kingfisher to name just a few.