Where does the Eurasian-Melanesian mountain belt run?

Answer 1

It goes above Australia, actually crossing with the Mid-Ocean Ridge, then continues left over the Himalayas and then the Alps, ending North of Africa.

I know this isn't a very detailed answer, but if you take a look at the related link, you will see in more detail..

Answer 2

The Eurasian-Melanesian mountain belt runs along the northern coast of Papua New Guinea, extending into Indonesia and connecting with the Himalayas. It is known for its complex geology and high levels of seismic activity.