The very first trek I made in 1977 with Neckermann in the valley of the Kali Gandaki river in Nepal. In 10 days we walked from Pokhara over Jomson to Muktinath at 4.400 m altitude. Two years later, in 1979 I made, what easily could have been the most difficult trek in my life with Hauser (Munich). It went in India from Manali through Zanskar to Kargil and Leh, the capital of Ladakh. The trek was 280 km which included crossing two passes at 5.300 m.  Ladakh, with its monasteries, was so beautiful and attractive that I came back two more times. I also made  in 2001 a second trek in Nepal with a colleague of the VUB. Other treks were made in Sri Lanka (2x), Peru and Bolivia (where I climb a mountain at 5.300 m), the Mulanje Mountain in Malawi and in the Tassali in Algeria. In 2000 I made a most impressive trek with Hauser in New Zeeland. I have also climbed the Mount Kenya (5.000 m) and the Kilimanjaro (5.895 m) even three times.