Eastport is a city and archipelago in Washington County. It is the easternmost city in the country and has the deepest port on the East Coast. Eastport is situated on Moose Island, which is connected to the mainland by a causeway. The city has a history of fishing, trading, smuggling, and canning. It also has a cultural scene with festivals, museums, and art galleries. Eastport is a popular destination for whale watching, birding, and exploring the natural wonders of Cobscook Bay and Passamaquoddy Bay.