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
Great Lakes Depression and bar-headed goose ("Anser indicus"). Only a few individuals of great white pelican ("Pelecanus onocrotalus") remain in the Great Lakes Basin in Mongolia. They nest in catchment areas of rivers and lakes that have abundant fish and vegetation. Although the total number of fish species in the region is low, a large percentage of those that do occur are endemic or near-endemic, especially from the genera "Oreoleuciscus" (Altai osmans), "Thymallus" (graylings) and "Triplophysa" (a stone loach genus). Great Lakes Depression The Great Lakes Depression (, "Ikh Nuuruudyn Khotgor"), also called the Great Lakes' Hollow is a large semi-arid depression in