Lakes and drumlins are major features dominating the peneplain surface of Meguma Group rocks of the Atlantic Interior (Region 400). Three types of drumlins are shown: those derived from slate (Unit 433) which hold moisture throughout the summer, and loose, droughty drumlins derived from granite (Unit 431) or quartzite (Unit 432). Lakes and associated bogs of the otherwise featureless Mersey Meadows (Unit 412) are shown in the left foreground.