It also yields the largest ones. These stand as high as 400 feet [100 m] above the waterline and can measure more than 200 miles [300 km] in length and 60 miles [90 km] in width.
वे उत्तर और दक्षिण - ध्रुव - प्रदेश के हिमनदों और हिमचादरों से आते हैं ।