Adults average 120–200 cm (3.9–6.6 ft) in length, with a maximum length (although rare) of about 7 feet. The supralabial scales have thermoreceptive pits.
A mostly arboreal species with a striking green or yellow color in adults, the color pattern on this species can vary dramatically from locality to locality. For example, the Aru local is a vivid green with a broken vertebral stripe of white or dull yellow scales, the Sorong local is a bright green with blue highlights and a solid vertical stripe, and the Kofiau local is mostly yellow with varying highlights in white or blue. Cyanomorphs (blue morphs) are also known to occur but are not considered common at this time.