Great Lakes Areas of Concern rivers, and oceans causing pollution and buildup of sediment. Nonpoint source pollution is said to be the most problematic and hardest to reverse of the types of pollution because it is so hard to regulate and pinpoint where it originates. Many experts agree that nonpoint source pollution is the biggest concern facing the Great Lakes. With the increase of urbanization, a toll has been taken on the lakes in these areas. Lakes that once had stable ecosystems with the appropriate amount of plant life are now full of massive amounts of plants and algae that have been fed by excess
Nipissing Great Lakes to with a mean stage of water about . The name "Nipissing beach" has from the first been applied to the shoreline formed during the two-outlet stage of the lakes. The name more precisely belongs to the older beach made by the Nipissing Great Lakes when the whole discharge passed through the Ottawa River. After the formation of the true Nipissing beach isostatic rebound elevated the region. This lowered the water plane on the north side of the basin and raised it on the south side. Thus the beach from the earlier stage of the Nipissing Great Lakes in the