A reserve that is not only a lake
The Dalai Lake reserve crosses two banners and Manzhouli. Its 740,000 hectares include wetland and grassland, not a single shoreline.
Hulunbuir is larger than the lake. The page used here is the Dalai Lake reserve: 740,000 hectares across New Barag Right Banner, New Barag Left Banner and Manzhouli. That figure is the reserve, not the water surface.
The Dalai Lake reserve crosses two banners and Manzhouli. Its 740,000 hectares include wetland and grassland, not a single shoreline.