A 30-mile maze canyons in Antarctica was carved out of bedrock by the catastrophic draining of subglacial lakes during global warming between 12 million and 14 million years ago, according to university researchers who warn a similar event today could have serious environmental consequences.
I wonder how many of these would be created in the future? Something to think about for Great Vision. Very important actually for that book idea.
Update: These are the Scablands, if you didn't know.