This 3-day adventure from Arusha or Moshi takes you to the wild north of Tanzania for a challenging climb up Ol Doinyo Lengai, the "Mountain of God," an active volcano. Along the way, you visit Lake Natron, a red salt lake where flamingos breed, and walk to the Engare Sero waterfalls, where cool pools offer a refreshing break. You spend 2 nights near Lake Natron. This tour is best for fit, adventurous travellers who enjoy hiking, as the climb is hard, steep, on loose ash, and starts at midnight. The volcano is active, so the climb can be cancelled for safety, and flamingo numbers depend on the season.