On Google Maps I just found a drain east of Newfoundland:
More details at https://www.scribblemaps.com/maps/view/What_is_that/Jafix1
I wonder what that could be?
I heard about issues from different datasources which can occur when Google mixes data from NOAA or other sources with their own. Or could that be issued by a giant ice mountain drifting southwards? Or from the last ice age?