Puncak Jaya
The highest mountain on the Australian mainland is Mount Kosciuszko, above sea level. However, the highest mountain in the Australian continent which includes Australia and New Guinea is Puncak Jaya, above sea level, in the Indonesian province of Papua on the island of New Guinea, which lies on the Sahul continental shelf with Australia. Mount Kosciuszko is easier to climb, being a four hour, grade 3 return walk from the nearest car park, while Puncak Jaya is classed as a mountaineering expedition.