Why is Bar Harbor whale watching among the best in the world? Because of the unique topography of the seafloor 20 miles off the coast of Bar Harbor, in the Gulf of Maine. Strong currents churn water up from the ocean floor to the surface, attracting critters all the way up the food chain. Swimming leisurely through this great cauldron of nutrients are the Great Whales.The most commonly seen are Finback, Minke and Humpback whales, although other species are often sighted.