Mount Berlin emerges from the West Antarctic Ice Sheet and rises to above sea level, making it the highest volcano in the Flood Range with slopes of about 12-13°. Berlin Crater, a wide summit crater, lies at the top of Mount Berlin; the highest point of the volcano lies by its southeastern rim. Mount Berlin consists of two overlapping edifices; the other part of the volcano is Merrem Peak, west-northwest. Merrem Peak is c. high and has a wide crater at its summit. These craters are aligned in east-west direction like other Flood Range calderas. Mount Berlin has variously been described as a composite volcano, shield volcano or stratovolcano with a volume of about . The entire edifice has a length of about . The volcano is the western end of the Flood Range; Wells Saddle separates it from Mount Moulton volcano farther east.