Bewani Mountains is a mountain range

Mountain range

A mountain range is a single, large mass consisting of a succession of mountains or narrowly spaced mountain ridges, with or without peaks, closely related in position, direction, formation, and age; a component part of a mountain system or of a mountain chain...

 in northwestern Papua New Guinea

Papua New Guinea

Papua New Guinea , officially the Independent State of Papua New Guinea, is a country in Oceania, occupying the eastern half of the island of New Guinea and numerous offshore islands...

. Together with the Torricelli Mountains

Torricelli Mountains

Torricelli Mountains is a mountain range in Sandaun Province, northwestern Papua New Guinea. The highest peak in the range is Mount Sulen at 1650 meters. The Bewani Mountains are located to the west, and the Prince Alexander Mountains are located to the east...

 and Prince Alexander Mountains

Prince Alexander Mountains

The Prince Alexander Mountains are a mountain range in Papua New Guinea. The range is located on the northern coast of New Guinea. The Torricelli Mountains lie to the west, and the basin of the Sepik River lies to the south...

 it forms the North Coastal Range of Papua New Guinea. Highest point of the mountains is at 1,960 m.

Geology

The Bewani-Torricelli-Prince Alexander Mountains, are presumed to have been formed as an island arc in the Late Eocene

Eocene

The Eocene Epoch, lasting from about 56 to 34 million years ago , is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Palaeocene Epoch to the beginning of the Oligocene Epoch. The start of the...

-Early Oligocene

Oligocene

The Oligocene is a geologic epoch of the Paleogene Period and extends from about 34 million to 23 million years before the present . As with other older geologic periods, the rock beds that define the period are well identified but the exact dates of the start and end of the period are slightly...

.

Ecology

As other mountain ranges in Papua New Guinea it is home to many rare species of fauna and flora and is highly biodiverse.
The Black Sicklebill

Black Sicklebill

The Black Sicklebill, Epimachus fastuosus, is a large bird of paradise of midmountain forests of New Guinea. The male has black plumage with an iridescent green, blue and purple scale-like feathers, red iris, bright yellow mouth, long curved black bill, huge sabre-shaped tail and large erectile...

 (Epimachus fastuosus) is a threatened species which is known from a few localities in the Bewani and Torricelli mountains.

Fiwo, a seubspecies of the Tenkile

Tenkile

The Tenkile , also known as Scott's Tree-kangaroo, is a species of tree-kangaroo in the Macropodidae family. It is endemic to a very small area of the Torricelli Mountains of Papua New Guinea. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss.The Tenkile...

 (Dendrolagus scottae) tree-kangaroo

Tree-kangaroo

Tree-kangaroos are macropods adapted for life in trees. They are found in the rainforests of New Guinea, far northeastern Queensland, and nearby islands. Although most are found in mountainous areas, several species also occur in lowlands, such as the aptly named Lowlands Tree-kangaroo...

, is thought to be endemic to Bewani Mountains.