sentences:  The St. Francis Lowlands are a flat region mostly covered with row crop agriculture today, though also containing sand blows and sunken lands remaining from the 1811–12 New Madrid earthquakes.Waterways have mostly been channelized, causing loss of aquatic and riparian wildlife habitat.The St. Francis Sunken Lands Wildlife Management Area, which preserves some of the bottomland hardwood forest typical of this ecoregion prior to development for row agriculture lies just west of Black Oak along the St. Francis River.