The D'Urville is the longest, most remote, and most heavily forested of the valleys draining into lakes Rotoiti and Rotoroa.
Access is best by boat up Lake Rotoroa (see Sabine Valley). The D'Urville can also be reached over Mole or Tiraumea saddles but the track in Bull Creek is no longer maintained, and the footbridge has been removed. Few climbs are known on the D’Urville side of the Mahanga and Ella ranges. Ella Hut (16 bunks, standard) is now renamed George Lyon Hut in honour of the long serving Chief Ranger who built many of the original two-roomed huts in the park.