sentences:  The headland was formed by the Cyclops Mountains, a mountain ridge rising steeply to 7,000 ft and was backed by a Lake Sentani, extending 15 miles east to west.Between the mountain ridge and the lake was a narrow plain, where the Japanese had built a number of airfields; three had been completed by April 1944 and a fourth was under construction.In the spring of 1944 the Allied South West Pacific Command determined that the area should be seized and developed into a staging post for their advance along the north coast of New Guinea into the Dutch East Indies and to the Philippines.