Franz Josef Glacier currently terminates from the Tasman Sea. Near the end of the last ice age about 18,000 years ago it extended to the present-day coastline or even beyond. As it retreated the glacier left behind moraines of accumulated rock and chunks of ice which created coastal hills and lakes. Lake Wombat is a kettle lake created by ice left in a moraine 9000 years ago, while Peters Pool close to the glacier's face arose in the same fashion just 210 years ago.