 The Southern Upland consists of poorly drained, gently-rolling, hilly topography that is characterized by glacially deranged drainages and extensive lakes and wetlands.A large grantic batholith, which has intruded slate and greywacke, underlies the Southern Uplands.Within this region, bedrock is poorly exposed as the result of low relief; a widespread surficial blanket of glacial till; and numerous large depressions filled with either wetland peat or occupied by lakes.