Trim line

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A trim line marks the previous height of Tana Glacier in Alaska

A trim line (or trimline) is a clear line on the side of a valley formed by a glacier. The line marks the most recent highest extent of the glacier. The line may be visible due to changes in color to the rock, or to changes in vegetation on either side of the line.

The term "trim line" is also used for similar looking phenomena caused by floods, volcanic activity, or tsunamis.^[1]