In geology, a proglacial lake is a lake formed either by the damming action of a moraine during the retreat of a melting glacier, a glacial ice dam, or by meltwater trapped against an ice sheet due to isostatic depression of the crust around the ice. At the end of the last ice age approximately 10,000 years ago, large proglacial lakes were a widespread feature in the northern hemisphere
https://en.wikipedia.org/wiki/Proglacial_lake
https://en.wikipedia.org/wiki/File:Hubbard_Glacier_July_16.2002.jpg