According to Brian Irwin, who interviewed native eyewitnesses on New Britain Island, Papua New Guinea, “One afternoon late in 2005, three people from Awirin Island . . . were on the beach on the south side of the adjacent unpopulated Dililo Island . . . when they observed an amazing creature moving in the water . . . a long neck and a long tail and had a total length of about 20 metres and a width of about 2 metres. The head was described as being ‘like a dinosaur’ with an ‘oval-like face’ . . . The skin of the animal was . . . khaki green in colour. Dermal frills . . . on the creature’s back.” The description strongly suggests a sauropod dinosaur (like an apatosaurus).
Irwin seemed more interested in another sighting (or he had more information), about an apparent Therizinosaurus “sighted occasionally on Umbungi Island in West New Britain, Papua New Guinea. Umbungi Island is located on the south coast of West New Britain between Kandrian and Gasmata.” That apparent dinosaur had “a long tail and a long neck and was 10–15 metres in length.”
See also Pterosaurs in Africa