landfast

There is an economy in the matter of breakages and repairs, for if the plough should be brought up upon a landfast rock, instead of the brunt coming simply on the draught rope, which would either snap or pull the framework of the plough to pieces, it is, through the pull of the one drum upon the other, immediately spread all over the field wherever the rope goes […]

1862, Arthur Young, John Chalmers Morton, The Farmer's Calendar

From the north of Baffin Island a hunting party has journeyed across the frozen sea to the floe edge, the line where landfast ice meets open water.

1990 August, John Bockstoce, “Changing Images of the Northwest Passage”, in National Geographic, volume 178, number 2, page 18