In July 1907, the first expedition established "Camp Alkmaar" near where the Noord River, since 1910 known as the Lorentz River, became unnavigable (), but was unsuccessful in penetrating to the highest mountain range. The Second South New Guinea Expedition also used Camp Alkmaar, from where it left on October 9, 1909. A group of nine, including Lorentz and Jan Willem van Nouhuys, were the first to reach the eternal snow of New Guinea at a height of on November 8, 1909. From the ridge they observed a large lake to the north, which Lorentz named Lake Habbema (), after a member of the expedition. No attempt was made to reach the Wilhelmina summit. The return trip was severe; with a loss of four expedition members, the explorers finally returned to Camp Alkmaar in mid-December.