This is a low lying area and it is permanently waterlogged and covered with fresh water swamp forest. Patches of forest and caves exist along the floodplain corridor. Traveling by boat allows for the best way to observe more lowland rainforest species like Cinnamon Headed Pigeon, Borneon Ground Cuckoo, Straw Headed Bulbul, Hooked Billed Bulbul as well as water birds like Ruddy Kingfisher, Blue-banded Kingfisher the endangered Storm Stork and Lesser Adjutant.
Along the coast road from Sukau to Sandakan you will have opportunities to see several species of terns and the critically endangered Christmas Island Frigatebirds.
Loagan Benut National Park
The Park is about 70 kilometers from Miri and centers around a large freshwater lake in which there are crocodiles, and which is fished by the Berewan tribe. Oriental Darters breed on an island in the lake.
Similajau National Park
The Park comprises habitats of beach forest, mangroves, kerangas or pole forest, and mixed dipterocarp forest. 185 species of birds have been recorded in the park, including all seven species of hornbill occurring in Borneo, Brown Hawk-Owl, Malaysian Eared-Nightjar, White-bellied Fish-Eagle, Storm’s Stork, Mangrove Whistler and Bornean Bristlehead.