Riverland was at the extreme eastern side of Hernando County, about where Hwy. 50 crosses the Withlacoochee River. It is still found on county maps as Riverland Crossing. A Champion Map of Hernando County shows a road roughly parallel to the CSX RR tracks, from Richloam/Clay Sink Road to the river, called Riverland Road. The Withlacoochee River is the boundary line between Hernando and Sumter Counties at that point.
I don't believe there was ever anything more than a small settlement there.