Louis-Philippe Loncke Australia Loncke Unsupported Death Valley Expedition
Louis-Philippe Loncke on the world’s first unsupported Simpson Desert expedition (500 miles, 35 days) in Australia in 2008. Photo used with permission of Louis-Philippe Loncke.

Loncke Death Valley Traverse: 8 days, 143 Miles

Belgian explorer Louis-Philippe Loncke recently completed an unsupported, solo trek traversing the length of Death Valley (North to South) in 8 days. Facing scorching temperatures and limited access to water, Loncke had planned to cover the 143 miles in 6 days but dehydration, gear troubles, and severe weather stretched his expedition longer.

Loncke claims that his trek was the first successful expedition of its kind, but expeditions like this are hard to verify. Loncke did not have a car to shuttle his gear or supplies nor did he utilize any caches – he carried all of his gear, food, and water – close to 95 lbs in all to start – on his back.

Watch this video and get a feel for what this expedition was like.


I love to prepare for such challenges, the pain in the knees, feet, lack of food and water is compensated by this immersive¬†experience with the desert and having the privilege to witness all its beauty –¬†Louis-Philippe Loncke

Loncke’s¬†past experience prepared him for Death Valley

Loncke is no stranger to the hardship that is required to complete a trek like this.

In 2007 Loncke completed one of the most remarkable treks in recorded history: a trek across the entire Tasmanian Wilderness – 310 miles and 49 days. The end became a battle for survival, as he ran out of food, had a dead GPS, and no communication with the outside world.Here are some of Loncke’s other expeditions that led him to the Death Valley traverse:

Here are some of Loncke’s other expeditions that led him to the Death Valley traverse:

  • 2006: World’s first, unsupported trek where someone has climbed¬†all of the highest peaks in West McDonnell National Park in Australia – 205 miles/11 days;
  • 2010: World’s first unsupported trek between its extreme latitudes (north to south) across Iceland – 350 miles, 19 days;
  • 2012:¬†World’s first human-powered (by foot in the mountains and kayak and packraft on Vistula river) trek from the highest point in Poland to the Baltic Sea – 750 miles, 30 days;
  • 2013: World’s first circumnavigation of Lake Titicaca by kayak – 680 miles, 38 days;
  • 2013: Failed attempt at the world’s first unsupported trek across the 2 largest salt flats in Bolivia – completed 110 miles, 7 days.

Has the Death Valley route been done in an unsupported, cache-free style before?

A complete traverse of Death Valley has been completed a number of times – with resupply and water caching.

According to Loncke’s research an unsupported traverse has been attempted twice by the same¬†American who employed a desert cart to transport his¬†gear. The American failed both times (on one trip, his cart would break down and he had to spend too much time repairing it; on another, he lost too much time ferrying gear across difficult terrain so he could drag his cart across it).Loncke believed he could do it with nothing more than strong legs, determination, and a backpack.

Sand Dunes Death Valley National Park Wikipedia Loncke Unsupported Death Valley Expedition
Sand dunes in Death Valley National Park. Photo from Wikipedia.

Quick Facts about Death Valley National Park

  • 95% of the park is Wilderness;
  • Northern part of the Mojave Desert and borders California and Nevada;
  • Largest National Park in the lower 48;
  • Hottest and driest location in the North America;
  • Broadwater Basin in Death Valley is 279 feet below sea level, and is the 2nd lowest point in the U.S.;
  • The 134 F temperature recorded in Death Valley in July 1913 remains the hottest ever recorded temperature on the surface of the earth.
Louis-Philippe Loncke Hiking Unsupported Death Valley Expedition
Louois-Philippe Loncke hiking through Death Valley. Photo used with permission of Louis-Philippe Loncke.

The Death Valley Expedition

After some adventurous hitchhiking from Las Vegas, Loncke began his trek in the afternoon sun. He opted to do some of his hiking at night when it was cooler, aided by the light of a full moon. Other than being forced to rest in the middle of the day due to extreme heat and leaky water bottles, the first two days passed without major incidents.

On the third day, Loncke stopped sweating,¬†couldn’t keep his heart rate down, and began to overheat. He reasoned that this¬†state was due to an¬†improper salt mix in his water which caused the salinity of his blood to be to high. As a result, he stopped sweating which is very dangerous especially so in a desert environment. His state continued to decline into day four when he decided to abandon his trip.

And then – as he was preparing to exit, he came across some pools of water where he was able to ditch some of his salty water supply and replace it with fresh water. He decided to continue and complete his trek.

I woke up at 1 am and started walking with the moonlight at 2 am until 7pm the same day. The first four days I stopped¬†during the heat of the day for several hours due to my overheating but the last days I could continue walking even during the¬†heat. –¬†Louois-Philippe Loncke

With each successive day, Loncke’s pack weight decreased and his speed increased. On the final night, he took a risky shortcut through some hills that saved 4 to 5 miles. The next day he completed his trek.

Is it possible to do this expedition in 6 days?

Loncke insists that an “athlete” who prepares well and takes the right gear would be able to do this trip in 6 days. He has the following suggestions for anyone willing to try:

  • Carry less water (25.5 L total);
  • Carry less food (14 lbs total);
  • Start before the full moon to take advantage of its full brightness in the middle of the trip;
  • Walk 18-20 hours a day (because you’ll have to cover almost 25 miles per day);
  • Leave extravagant camera gear behind – it’s just extra weight;
  • He even thinks it is possible to do an out and back trip in 11 days provided you are ready to run on the final day!

How tough was this expedition?

Loncke was on the move for 16 hours a day (averaging almost 19 miles per day) through some of the harshest terrain on the planet. Death Valley has more than 20 different classifications of terrain, limited access to water, and the conditions are hot and dry. The physical and psychological toll, especially on a solo trek, can be excruciating.

Louis-Philippe Loncke Celebrating Unsupported Death Valley Expedition
Louois-Philippe Loncke celebrating during his adventure. Photo used with permission of Louis-Philippe Loncke.