A sea tractor is a
motor vehicle
A motor vehicle, also known as motorized vehicle or automotive vehicle, is a self-propelled land vehicle, commonly wheeled, that does not operate on rails (such as trains or trams) and is used for the transportation of people or cargo.
The ...
designed to travel through shallow seawater, carrying passengers on a platform elevated above a submerged chassis. The sea tractor was most popular during the early 1930s, as a unique way to give scenic tours to patrons of waterfront hotels and resorts. In other applications, sea tractors were used simply as a ferry through shallow waters. The use of sea tractors has declined since, as
boat
A boat is a watercraft of a large range of types and sizes, but generally smaller than a ship, which is distinguished by its larger size, shape, cargo or passenger capacity, or its ability to carry boats.
Small boats are typically found on i ...
s,
ferries
A ferry is a ship, watercraft or amphibious vehicle used to carry passengers, and sometimes vehicles and cargo, across a body of water. A passenger ferry with many stops, such as in Venice, Italy, is sometimes called a water bus or water taxi ...
, and other aquatic vessels often serve the same function much more efficiently and comfortably.
Examples

The
hotel
A hotel is an establishment that provides paid lodging on a short-term basis. Facilities provided inside a hotel room may range from a modest-quality mattress in a small room to large suites with bigger, higher-quality beds, a dresser, a ref ...
at
Burgh Island
Burgh Island is a tidal island on the coast of South Devon in England near the small seaside village of Bigbury-on-Sea. There are several buildings on the island, the largest being the Art Deco Burgh Island Hotel. The other buildings are thr ...
operates a sea tractor, to carry hotel guests and other visitors the to the island at high tide, when the causeway connecting the island to the Devon mainland is submerged. The current tractor is the third one to be used at this location.
A sea tractor is also used at South Sands Beach near
Salcombe
Salcombe is a popular resort town in the South Hams district of Devon, south west England. The town is close to the mouth of the Kingsbridge Estuary, mostly built on the steep west side of the estuary. It lies within the South Devon Area of ...
, Devon. The beach has no jetty or pier, and the South Sands Ferry therefore cannot reach dry land to pic