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photo: multi-year ice; note puddles color; eroded surface; numerous puddles; thaw holes in the background (Environment Canada)
Old ice up to 3 m or more thick which has survived at least two summers' melt. Hummocks even smoother than Second year ice, and the ice is almost salt-free. Color, where bare, is usually blue. Melt pattern consists of large interconnecting irregular Puddle s and a well- developed drainage system