Two major regions in Antarctica — the West Antarctic Ice Sheet and the East Antarctic Ice Sheet — are connected by enormous valleys that cross the continent. These canyons — now called Foundation Trough, Patuxent Trough and Offset Rift Basin — were unknown and undescribed until a recent survey.
Foundation Trough is the longest of the canyons, measuring 217 miles (350 kilometers) long and 22 miles (35 km) wide. These "highway" valleys enable the flow of ice from the larger and more stable East Antarctic Ice Sheet to its smaller neighbor.
Originally published on Live Science.