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The center line of the glacier, known as the medial moraine, was strewn with boulders that had tumbled and drifted down from the peak.

It looked easy enough to follow up the medial moraine to what we called the Island, a low mountain pushed out from the frontier ridge into the great sea of ice.

The clouds were just coming up as we halted on the medial moraine.

Reaching the confluence of the Finsteraar and Lauteraar branches, we went downwards with long swinging strides, close alongside the medial moraine of the trunk glacier.

If a glacier have but two branches, it will have only one medial moraine; if it have three branches, it will have two medial moraines; if n branches, it will have n-1 medial moraines.