For things on the planetary surface I find it's useful to visualise a flatter shape. In this case I go for a 10 meter thick square that's 1700km on each side.

For things on the planetary surface I find it's useful to visualise a flatter shape. In this case I go for a 10 meter thick square that's 1700km on each side. So Antarctica is about 5000km across. That's a lot of ice.