The inferior lobe of the left lung is divided from the superior lobe by the oblique fissure. It comprises almost the whole of the base, a large portion of the costal surface, and the greater part of the posterior border. The inferior lobe is the larger of the two lobes of the left lung. The inferior lobe of the right lung is similar to the inferior lobe of the left lung. The oblique fissure separates the lower lobe from the middle and upper lobe. It is the largest of the three lobes of the right lung and is located behind and below the oblique fissure.