Johnston Glacier is a glacier

Glacier

A glacier is a large persistent body of ice that forms where the accumulation of snow exceeds its ablation over many years, often centuries. At least 0.1 km² in area and 50 m thick, but often much larger, a glacier slowly deforms and flows due to stresses induced by its weight...

 flowing in a southeast direction along the north side of Mount Owen

Mount Owen (Antarctica)

Mount Owen is a mountain on the eastern coast of Palmer Land on the Antarctic Peninsula. It stands 1,105 m in height, and was named by Ronne for Arthur Owen, a member of the Ronne Antarctic Research Expedition....

 to the head of Nantucket Inlet

Nantucket Inlet

Nantucket Inlet is an ice-filled inlet 6 nautical miles wide, which recedes 13 nautical miles in a northwest direction between the Smith and Bowman Peninsulas, along the east coast of Palmer Land...

, on the east coast of Palmer Land

Palmer Land

Palmer Land is that portion of the Antarctic Peninsula which lies south of a line joining Cape Jeremy and Cape Agassiz. This application of Palmer Land is consistent with the 1964 agreement between US-ACAN and UK-APC, in which the name Antarctic Peninsula was approved for the major peninsula of...

. Discovered by the Ronne Antarctic Research Expedition

Ronne Antarctic Research Expedition

The Ronne Antarctic Research Expedition was an expedition from 1947-1948 which researched the area surrounding the head of the Weddell Sea in Antarctica.-Background:...

 (RARE), 1947–48, under Ronne, who named it for Freeborn Johnston, of the Dept. of Terrestrial Magnetism at Carnegie Institute

Carnegie Institute

Carnegie Institute can refer to:*Carnegie Institute, operator of the Carnegie Museums of Pittsburgh, Pittsburgh, Pennsylvania*Carnegie Institution for Science , Washington, D.C....

, Washington, DC, in recognition of his contributions to the planning of the geophysical program and the working up of the results for the expedition.