. The range is flanked by broken and difficult country, particularly on the south-western side. There are few practicable passes, the easiest being the famous
Kokoda Track which crosses the range between
Port Moresby and
Buna and was in use for more than 50 years as a regular overland mail-route. Another route used by the 900 men of the US 2nd Battalion,
126th Infantry Regiment,
32nd Division, was the
Kapa Kapa Trail, parallel to but to the southeast of the Kokoda Track. They took nearly five weeks to cover the track over extraordinarily difficult jungle terrain, from 14 October to 20 November 1942. Vehicular roads, though not impossible, would be very difficult and expensive to construct. In fact one was constructed during
World War II crossing from
Wau in the north to Bulldog in the south and known as the
Bulldog Track. It was largely due to the impossibility of transporting heavy equipment across the range that the Japanese failed to secure Port Moresby as a base early in 1942. The mountains are rough and precipitous, with occasional fertile plateaus which are occupied by native food-gardens. ==Eponyms==