Barker Passage is a channel through reef about a kilometre south of North Island in the Houtman Abrolhos.[1] Its gazetted location is 28°19′15″S 113°37′15″E / 28.32083°S 113.62083°E,[2][3] but it is actually located nearly 2½ kilometres west of there, at approximately 28°18′58″S 113°35′54″E / 28.31611°S 113.59833°E.