The Junction Canal was a canal in the states of New York and Pennsylvania in the United States.
 The canal was also called the Arnot Canal, after the name of its principal stockholder, John Arnot of Elmira, New York.
 The canal was built and operated by a private stock company.
 The canal was partly open in 1854, but the entire length was not finished until 1858.
 The completed canal was 18 mi long and had 11 locks.
 Then intent was to lengthen the reach of the Chemung Canal deeper into Pennsylvania in order to connect to the canal systems there.
 Competition with railroads led to diminished use of the canal.
 In 1865 the canal was severely damaged by a flood.
 In 1866, the stock company was authorized to change its name to the "Junction Canal and Railroad Company," and work commenced in constructing a railroad on its right of way.
 The canal was last used in 1871, and was then abandoned.
The Miami and Erie Canal was a canal in Ohio that ran about 274 mi ; it was constructed from Cincinnati to Toledo to create a water route from the Ohio River to Lake Erie.
 Construction on the canal began in 1825 and was completed in 1845 at a cost to the state government of $8,062,680.07.
 At its peak, it included 19 aqueducts, three guard locks, 103 canal locks, multiple feeder canals, and a few man-made water reservoirs.
 The canal climbed 395 ft above Lake Erie and 513 ft above the Ohio River to reach a topographical peak called the Loramie Summit, which extended 19 mi between New Bremen, Ohio to lock 1-S in Lockington, north of Piqua, Ohio.
 Boats up to 80 feet long were towed along the canal by mules, horses, or oxen walking on a prepared towpath along the bank, at a rate of four to five miles per hour.
Landsford Canal State Park is a South Carolina state park located in Chester County, two miles (3.2 km) from US 21.
 The 448 acre park contains the ruins of the Landsford Canal built to bypass rapids on the Catawba River using slave labor between 1820 and 1825.
 The coming of the railroad caused the canal to be abandoned.
 The former lock-keeper's house contains an interpretive museum.
 In addition to the canal, visitors also can see one of the largest remaining stands of "Hymenocallis coronaria", the Shoals spider-lily, that grows in the shoals of the river, and bloom mid-May through mid-June.
 The park offers hiking, picnicking, boating, and fishing.
The Derby Canal ran 14 mi from the Trent and Mersey Canal at Swarkestone to Derby and Little Eaton, and to the Erewash Canal at Sandiacre, in Derbyshire, England.
 The canal was authorised by an Act of Parliament in 1793 and was fully completed in 1796.
 It featured a level crossing of the River Derwent in the centre of Derby.
 An early tramroad, known as the Little Eaton Gangway, linked Little Eaton to coal mines at Denby.
 The canal's main cargo was coal, and it was relatively successful until the arrival of the railways in 1840.
 It gradually declined, with the gangway closing in 1908 and the Little Eaton Branch in 1935.
 Early attempts at restoration were thwarted by the closure of the whole canal in 1964.
 Since 1994, there has been an active campaign for restoration spearheaded by the Derby and Sandiacre Canal Trust and Society.
 Loss of the Derwent crossing due to development has resulted in an innovative engineering solution called the Derby Arm being proposed, as a way of transferring boats across the river.
The Erie Canal is a canal in New York that is part of the east–west, cross-state route of the New York State Canal System (formerly known as the New York State Barge Canal).
 Originally, it ran 363 mi from Albany, on the Hudson River, to Buffalo, at Lake Erie.
 It was built to create a navigable water route from New York City and the Atlantic Ocean to the Great Lakes.
 When completed in 1825, it was the second longest canal in the world (after the Grand Canal in China) and greatly affected the development and economy of New York, New York City, and the United States.
The popular song "Low Bridge, Everybody Down" was written in 1905 by Thomas S. Allen after Erie Canal barge traffic was converted from mule power to engine power, raising the speed of traffic.
 Also known as "Fifteen Years on the Erie Canal", "Fifteen Miles on the Erie Canal", "Erie Canal Song", and "Mule Named Sal", the song memorializes the years from 1825 to 1880 when the mule barges made boomtowns out of Utica, Rome, Syracuse, Rochester, and Buffalo, and transformed New York into the Empire State.
 The tune is sadly nostalgic.
The Karakum Canal (Qaraqum Canal, Kara Kum Canal, Garagum Canal; Russian: Каракумский канал , "Karakumsky Kanal", Turkmen: Garagum kanaly , گَرَگوُم كَنَلیٛ, "Гарагум каналы") in Turkmenistan is one of the largest irrigation and water supply canals in the world.
 Started in 1954, and completed in 1988, it is navigable over much of its 1375 km length, and carries 13 km3 of water annually from the Amu-Darya River across the Karakum Desert in Turkmenistan.
 The canal opened up huge new tracts of land to agriculture, especially to cotton monoculture heavily promoted by the Soviet Union, and supplying Ashgabat with a major source of water.
 Unfortunately, the primitive construction of the canal allows almost 50 percent of the water to escape en route, creating lakes and ponds along the canal, and a rise in groundwater leading to widespread soil salinization problems.
 The canal is also a major factor leading to the Aral Sea environmental disaster.
Susan May Williams Bonaparte (April 2, 1812 – September 15, 1881) was the daughter of Benjamin Williams, a prominent Baltimore merchant (originally from Roxbury, Massachusetts), and his wife, Sarah Copeland, widow of Nathaniel Morton.
 In response to the opening of the Erie Canal, which was in direct competition with the port of Baltimore, her father became one of the founders of the Baltimore and Ohio Railroad, the first railroad company in the United States, chartered on April 24, 1827.
The Rhine–Main–Danube Canal (German: "Rhein-Main-Donau-Kanal"; also called Main-Danube Canal, RMD Canal or Europa Canal), in Bavaria, Germany, connects the Main and the Danube rivers across the European Watershed, running from Bamberg via Nuremberg to Kelheim.
 The canal connects the North Sea and Atlantic Ocean to the Black Sea, providing a navigable artery between the Rhine delta (at Rotterdam in the Netherlands), and the Danube Delta in south-eastern Romania and south-western Ukraine (or Constanța, through the Danube–Black Sea Canal).
 The present canal was completed in 1992 and is 171 km long.
The Clinton–Kalamazoo Canal is a canal in Michigan that was abandoned after being only partially completed.
 The canal was to connect Lake St. Clair with Lake Michigan.
 Project backers were inspired by the success of the Erie Canal in New York, which was completed in 1825.
 After gaining statehood in 1837, Michigan elected its first governor, Stevens Thomson Mason, who initiated an ambitious program of internal improvements, including three railroads and two canals.

Question: What canal was completed in 1825?
Answer: When completed in 1825