Free flowing streams or rivers?
Ponds?
Man made lakes used for power generation?
I've done all three myself. Started out fishing free flowing river in the days before damns became so common on the rivers of the south. Continued after the damns backed up the water behind them for power generation. Fished some catfish ponds also.
I think I like the old days of free flowing rivers the best. When I was a boy we could fish all week end and never see another boat or fisherman lots of times.
CM