Johnston Peak is a sharp dark peak

Summit (topography)

In topography, a summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a local maximum in elevation...

, 7 nautical miles (13 km) north of Mount Marr

Mount Marr

Mount Marr is a rock peak which rises above the surrounding ice surface 8 nautical miles south of Johnston Peak and 8 nautical miles west of Douglas Peak, in Enderby Land. It was discovered in January 1930 by the British Australian New Zealand Antarctic Research Expedition under Douglas Mawson...

 and 11 nautical miles (20 km) northwest of Douglas Peak

Douglas Peak

Douglas Peak is a peak, 1,525 m, lying 11 nautical miles southwest of Mount Codrington and 8 nautical miles east of Mount Marr. It was discovered in January 1930 by the British Australian New Zealand Antarctic Research Expedition under Mawson, and named for Flight Lieutenant E. Douglas, RAAF, a...

. It was discovered in January 1930 by the British Australian New Zealand Antarctic Research Expedition (BANZARE) under Mawson, who named it for Professor T. Harvey Johnston, the chief biologist to the expedition.