volcano

It can even be “quite literally an edge,” as when a man stands on the edge of an active volcano.

Made up of thousands of islands, the Philippines sits in the so-called Ring of Fire, a seismic arc of volcanoes and fault lines around the Pacific basin that also includes Indonesia and Japan.

It is located on the geologically unstable "Ring of Fire" - so called because of the high number of earthquakes and volcanoes that occur here.

Now aged 62, her five-day trek to the top of the dormant volcano in Tanzania, is her latest challenge in a bid to raise funds for charity Prevent Breast Cancer.

At a press conference on the side of a volcano on Tanna island, one of 80 plus in the Vanuatu archipelago, Marles emphasised the "shared destiny" of the two countries.