An open space in the ice on a river or lake.
An everglade.
An open passage through a wood; a grassy open or cleared space in a forest.
A bright surface of ice or snow.
An ice dam (ice jam), a blockage of ice in a river starting with an ice floe in the river.
Any type of sea ice not attached to land, drift ice.
A flat mass of floating ice, smaller than an ice field.
An ice stream (ice flow), a type of fast moving glacier