[5] Mount Victoria (4,038 m) in the Owen Stanley Range is the ecoregion's highest peak.

[7] The Bowutu Mountains and eastern Kuper Range consist of ultramafic rocks derived from oceanic crust and upper mantle.

[9] Distinctive plant genera of southeastern Papuan region include Magodendron, Anthorrhiza, Kairoa, and Cephalohibiscus.

Seven mammal species are endemic: broad-striped dasyure (Paramurexia rothschildi), giant bandicoot (Peroryctes broadbenti), Papuan bandicoot (Microperoryctes papuensis), New Guinea big-eared bat (Pharotis imogene), Chiruromys lamia, Long-nosed mosaic-tailed rat (Melomys levipes), and Van Deusen's rat (Rattus vandeuseni).

[12] Four species are endemic to the ecoregion – the brown-headed paradise kingfisher (Tanysiptera danae), grey-headed munia (Lonchura caniceps), streaked bowerbird (Amblyornis subalaris), and eastern parotia (Parotia helenae).