© Illuminated commercial dock on lake at night

© Tugboat moored on lake at night

© Germany, Hamburg, harbor with tugboats

© Germany, Hamburg, Mooring area Neumuehlen, Towboat, Elbe river at sunset

© Curacao, Willemstad, Punda, tugboats and colorful houses at waterfront promenade

© Curacao, Willemstad, Punda, tugboats and colorful houses at waterfront promenade

© USA, New York City, tugboat on Upper New York Bay with Statue of Liberty in background

© Aerial photograph of a barge and tug on the Chesapeake Bay

© Silhouette of tugboat and fog over city skyline

© Tugboat and ship moored in harbor

© Cargo containers on freighter at shipping port near tugboat

© Cargo containers on freighter at shipping port near tugboats

© Cargo containers on freighter at shipping port near tugboats

© Tugboat in harbor at shipping port

© Cargo containers on freighter at shipping port near tugboat

© Tugboat and container ship in industrial harbor

© Tugboat and container ship in industrial harbor

© Tugboat and container ship in industrial harbor

© Ducks swimming in urban harbor

© Yacht and cloudy sky reflected in urban harbor

© Oil tanker with tugboat at sea

© Oil tanker with tugboat at sea