Whale watching crews leave regularly from Plymouth, Barnstable and Provincetown Harbors, and most guarantee a sighting. No matter where you embark, your cruise will take you to Stellwagen Bank National Marine Sanctuary, the Atlantic whales' favorite feeding grounds. Each year, beginning in late winter, whales return to the Sanctuary, which encompasses more than 600 square nautical miles. Since the water is shallow here, plankton upon which whales feed, rises closer to the surface. You'll see whales breaching (leaping straight out of the water into the air), spyhopping (holding their heads high out of the water as if having a look around) or sounding (executing a dive). Enjoy summer sunset whale watches, expert commentary from on-board naturalists and private charters. Provincetown is the closest port to the densely populated Stellwagen Bank making it an ideal whale watching departure point. Board one of the whale watching vessels in Provincetown Harbor, for a 3-hour whale watch into the waters of Stellwagen Bank.