Explanation:

- Grand Canal:

- The Grand Canal in China is the world's longest man-made waterway. It stretches over 1,100 miles (1,770 kilometers), connecting Beijing in the north to Hangzhou in the south. Construction began in the 5th century BC.

- Suzhou Canal:

- This is a part of the Grand Canal network but not the entire canal itself. It's known for running through the picturesque city of Suzhou.

- Kiel Canal:

- Located in Germany, this canal connects the North Sea to the Baltic Sea, facilitating maritime trade but is not the longest.

- Corinth Canal:

- In Greece, this canal cuts through the Isthmus of Corinth. It is much shorter than the Grand Canal.