Question: One of the largest natural harbors in the world is federally owned and operated and at the mouth of the Hudson River is part of the Port of which two states?

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Vathy, Meganisi: Vathy (Greek: Βαθύ ) is a town on the island of Meganisi, which is part of the Lefkada regional unit in Greece.  It has one of the world's largest natural harbors.

Port of Iloilo: The Port of Iloilo in Iloilo City, Philippines, serves the province and city of Iloilo and the entire Panay Island, in Western Visayas of the Philippines.  It is located away from the older port facilities on the Southern coast of Panay Island, in the Panay Gulf, and one of the country’s safest and most natural harbors.  Guimaras Island shields the port from violent storms and makes it ideal for harboring ships and vessels.

Stockport Creek: Stockport Creek is a 2.4 mi tributary to the Hudson River in the town of Stockport, New York, in the United States.  Its source is the confluence of Kinderhook Creek and Claverack Creek near the village of Stockport.  Its mouth is at the Hudson River at the western boundary of Stockport.  The creek is tidal for about one mile inland from the Hudson River.

St. Joseph, Gulf County, Florida: St. Joseph was a boomtown that briefly became the largest community in Florida, before being destroyed only eight years after it was founded.  St. Joseph was founded in 1835 on the shores of St. Joseph Bay, one of the finest natural harbors on the Gulf Coast of the United States.  The townsite is in Gulf County, Florida, near the city of Port St. Joe.

Maiden Lane Bridge: The Maiden Lane Bridge was a railroad bridge across the Hudson River between the city of Albany and Rensselaer County, New York.  It was designed by Kellogg, Clark & Co., and was one of the largest bridges they designed.  The bridge was owned and built by the Hudson River Bridge Company, which was owned jointly by the New York Central and Hudson River Railroad Company which owned 3/4, and the Boston and Albany Railroad Company which owned 1/4.  The Maiden Lane Bridge was often referred to as the "South Bridge", while the Livingston Avenue Bridge was referred to as the "North Bridge".  The Livingston Ave. Bridge was used for freight (and through-traffic passenger trains) while passenger trains used the Maiden Lane Bridge for access to Union Station, which was completed less than 10 months later.  The state of New York authorized construction on May 10, 1869, construction began in May 1870, and the first train crossed on December 28, 1871.  The bridge consisted of four 185.5 ft long fixed spans, one 274 ft long draw span, seven 73 ft long spans over the Albany Basin, one 110 ft long span over Quay Street, and one 63 ft long span over Maiden Lane.  All the spans except the one over Maiden Lane were double tracked, through, and pin connected; the span over Maiden Lane was also double tracked, but was a deck and plate girder span.  A reconstruction of the bridge, except for the draw span, was done in 1899 by Pencoyd Bridge Company and finished by January 3, 1900.  The bridge lasted until the 1960s, when the Albany-Rensselaer Amtrak Station was built on the east side of the Hudson in the city of Rensselaer and Interstate 787 was built along the west side in Albany, thereby eliminating the need of the bridge.

Historic preservation in New York: Historic preservation in New York is activity undertaken to conserve forests, buildings, ships, sacred Indian burial grounds, water purity and other objects of cultural importance in New York in ways that allow them to communicate meaningfully about past practices, events, and people.  Governmental programs for historic preservation range from Federal ownership and active operation of sites (such as the Statue of Liberty and Ellis Island in New York Harbor) to grants and subsidies provided by state government, municipal support of museums and interpretative displays (such as roadside plaques and town-history websites).  Nonprofit programs include activities of statewide and local historical associations and museums, and activities of historical societies and museums at the national level.  Quasi-governmental organizations, such as the New York State Thruway Authority and Thousand Islands Bridge Authority (which have historic sites on their property), play a role as well.  Private endeavors, such as investment and other choices made by private landowners to conserve historical features of their properties, are significant but less visible and include groups such as the Historic Districts Council, The New York Landmarks Conservancy and the Preservation League of New York State.  During the reconstruction of the World Trade Center site in July 2010, a team of archaeologists discovered a 32-foot-long boat.  The craft was at least 200 years old, dating from a time when the Hudson River was partly filled with trash and debris because of a rapidly expanding lower Manhattan.

Hudson Canyon: The Hudson Canyon is a submarine canyon that begins from the shallow outlet of the estuary at the mouth of the Hudson River.  It extends out over 400 mi seaward across the continental shelf finally connecting to the deep ocean basin at a depth of 3 to 4 km below sea level.  It begins as a natural channel of several kilometers width, starting as a 20-40 m depression at Hudson Channel southward from Ambrose Light, then carving through a deep notch of about 1 km depth in the shelf break, and running down the continental rise.  Tidally associated flows of about 30 cm/s (1 km/h) up and down the deeper parts of the canyon have been recorded.  As silt, sand and mud are carried down the Hudson River, they flow into the canyon and out into the deep sea.

Port of New York and New Jersey: The Port of New York and New Jersey is the port district of the New York-Newark metropolitan area, encompassing the region within approximately a 25 mi radius of the Statue of Liberty National Monument.  It includes the system of navigable waterways in the New York–New Jersey Harbor Estuary, which runs along 650 mi of shoreline in the vicinity of New York City and northeastern New Jersey, as well as the region's airports and supporting rail and roadway distribution networks.  Considered one of the largest natural harbors in the world, the port is by tonnage the third largest in the United States and the busiest on the East Coast.

New York Harbor: New York Harbor, part of the Port of New York and New Jersey, is at the mouth of the Hudson River where it empties into New York Bay and into the Atlantic Ocean at the East Coast of the United States.  It is one of the largest natural harbors in the world.  Although the United States Board on Geographic Names does not use the term, "New York Harbor" has important historical, governmental, commercial, and ecological usages.

Geography of New York–New Jersey Harbor Estuary: The New York–New Jersey Harbor Estuary, also known as the Hudson-Raritan Estuary, is in the Mid-Atlantic states states of New Jersey and New York on the East Coast of the United States.  The system of waterways of the Port of New York and New Jersey forms one of the most intricate natural harbors in the world.  The harbor opens onto the New York Bight in the Atlantic Ocean to the southeast and Long Island Sound to the northeast.

Supporting paragraphs: Historic preservation in New York New York Harbor
Answer: New York and New Jersey