Historically, right whales were found in both the western and eastern North Atlantic. Extensively hunted until the mid to late 1800s, the remnant population is now mostly confined to the Eastern Seaboard of North America. Five areas of high right whale concentration have been identified and designated as either critical habitats (three in the United States) or conservation areas (two in Canada). Much of the research effort on right whales has been directed at these areas, and therefore, most of the photographed sightings are there. Right whales range from Florida to Norway, but no additional areas with large aggregations have been found.