The area is also known as Samarinda Beach. It is a dynamic delta area with mangrove and nypah swamp behind tidal mudflats.
Based on 1987 survey, there is no high number of waterbirds (highest number 2263, with 1 roosting group of 1410 birds). There are some important species such as Chinese Egret Egretta eulophotes and Lesser Adjutant Leptoptilus javanicus (29 birds). The first record for Sunda Teal Anas gibberifrons, Grey Duck Anas superciliosa, Greater Flameback Chrysocolaptes lucidus in Kalimantan. Greater Flameback Chrysocolaptes lucidus is specific species for mangrove with very limited information about its distribution.
Non-bird biodiversity: Orcaella brevirostris, Presbytis rubicunda, Hylobathes muelleri, Nasalis larvatus and Crocodylus porosus (Eve & Guigue 1989)
BirdLife International (2020) Important Bird Areas factsheet: Delta Mahakam. Downloaded from http://www.birdlife.org on 25/02/2020.