If you need a large expanse of frozen sea for an epic winter conflict, this gridless battle map may serve your needs.

This image is intended for a 50x50 square map, using Roll20's usual 70x70 pixel squares. You should be able to stretch or shrink it for other VTTs without issue.

The full map is nearly 5 mb, so the preview above is just a small section of the map. Please download the full map image that is linked below for your games.