She'd had some experience climbing, but this was by far her most challenging trek.

It boasts of some of the lowest temperatures making it a challenging trek for the adventurers.

Perhaps the island's most challenging trek is to the top of Morne Diablotin (4,747 feet), Dominica's tallest mountain.

The participants went on a challenging sponsored trek to the Arctic, on husky-powered sledges.

I spent about a half a day at Zoni, which I was assured would be worth the challenging trek to find it.

The view of Machu Picchu from the summit is breathtaking, and requires a challenging 1.5-hour trek up the mountain, with approximately 1700 wood and rock steps.

The starting point of this challenging trek is Bari Village, located 12 km away from Bhandardara.

Mark Wilson said about the walk "We are doing this challenging trek to raise awareness of the NSPCC and Childline, helping to raise funds to allow them to run this vital service.

Often referred to as the most challenging trek in the Indian Himalaya, it's more than worth the effort.

Each team then travels with Ben to a different region of the world to undertake a challenging trek.