By Shannon Lane @Shannonroselane

AT 3726m tall, and actively erupting, it’s difficult not to be intimidated by the second largest volcano in Indonesia

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The rough terrain and steep slopes make the volcano hike no easy task

Mount Rinjani is one of the 452 volcanos in the infamous ‘Ring of Fire’ along the perimeter of the Pacific Ocean.

But its imposing height doesn’t stop tourists and locals hiking to the peak to witness some of the most beautiful views in the country.

Lake Segara Anak is thought of as spiritual by locals, and is 20-22 °C.

Photographer Mate Valtr visited this mountain sprinkled with waterfalls, forests, and the spiritual crater lake, Segara Anak, which bubbles at 20-22 °C.

The hike across the volcano takes between 2 - 4 days

It takes two to three days to trek across the steep volcano, and more adventurous visitors can take an extra day to reach the summit for the once-in-a-lifetime views.

Mate Valtr said: "One night was spent in a camp on the edge of the crater rim"

Mate Valtr said: "One night is spent in a camp on the edge of the crater rim with a breathtaking view of a volcanic lake, literally above cloud level.”

At 3726m high, the travellers walk above the clouds

“To reach the summit it's necessary to wake at 3am. In the pitch-dark night you start walking up slippery steep slopes, with the help of a headlight unless you fancy the risk of plummeting a few dozen metres.”

The local porters travel with the tourists, and make the walk appear easy

Within the Lake Sagara Anak is the baby volcano Mount Barujari, a result of numerous eruptions in the 1990’s. This lake is where the local Balinese people pray, and offer jewellery to the mountain spirits.

The views from the highest points of the volcano are some of the most beautiful in the country

Minor eruptions are always taking place on the mountain, the largest being as recent as October 2015. The local guides and porters however, are never hesitant to climb the mountain with tourists.

The views from the mountain are a once-in-a-lifetime experience

Mate Valtr explains: “The most fascinating thing to me was the porters - local guys who are hired to carry supplies and tents that easily weigh close to 40kg.

Despite the risks of climbing on an active volcano, tourists travel for the breathtaking views

"They do pretty much the same trek as you, but with unmatched effortless - with only flip-flops on their feet!

"It was a memorable and surrealistic experience, stepping up against the dark silhouette of a big mountain, with an endless starry sky behind it. And then watching the sunrise.”