My understanding is that this map covers the general area to the north and to the south of the entry of the La Grande River into James Bay. Is that correct?
I guess, as Mr. Penn said, it covers the area Hydro-Québec had projected the flume of fresh water flow would cover. In that sense it covers the area that might be affected by changes in flow out of La Grande River, but isn't necessarily representative of what might be happening further south along the coast, all the way down to Rupert Bay.