The Kokoda Track passed through what was referred to during the early war years as "the (Kokoda) Gap". To the Japanese, who had learned of the Gap through vague explorer's accounts, it potentially offered a corridor from Buna through the Owen Stanleys along which they could launch a quick advance on Port Moresby. Conversely, the Allies believed it was a narrow and largely impassable path that could be blocked and held with only limited resources. In reality, the Gap is a dip in the Owen Stanley Range about wide, convenient for aircraft crossing the range to pass through.