The Grand Canal of China, also known as the Beijing-Hangzhou Grand Canal (京杭大运河) is the largest ancient canal or artificial river in the world. The oldest parts of the canal can be traced back to 5th century B.C.
 
In the year of 604, Emperor Yang Jian (杨坚) of Sui Dynasty left Chang'an, and made his rounds in Luoyang. In 605, the emperor gave an order to build two projects: transferring the capital from Chang'an to Luoyang and excavating the Grand Canal linking Beijing and Hangzhou . It took over six years to build the Grand Canal linking all the canals along it and connecting Haihe (海河) , Yellow River (黄河) , Huaihe (淮河) , Yangtze (长江) and Qiantangjiang rivers (钱塘江) . The Grand Canal starts north in Beijing and ends south in Hangzhou with a total length of 1,794 kilometers.

In accordance with the writings published, after leaving Hangzhou, the canal passes round the eastern border of the Lake Tai (太湖) , surrounding in its course the beautiful city of Suzhou , and then trends in a generally north-westerly direction through the fertile districts of Jiangsu as far as Jingjiang (靖江) on the Yangtze.

In the southern section, the slope is gentle and water is plentiful. Between Suzhou and Jingjiang the canal is often over 100 feet wide, and its sides are in many places faced with stone. It is spanned by fine stone bridges, and near its banks are many memorial arches and lofty pagodas.

In the central portion of the canal, that is between Jingjiang and Qingjiangpu, at which latter place it crosses the dry channel which marks the course of Yellow River before 1852, the current is strong and difficult to ascend in the upward (northern) journey. This part of the canal skirts several lakes and is fed by the Huai He as it issues from the Xingzuo lake. The country lying west of the canal is higher than its bed; while the country east is lower than the canal, The two regions are known respectively as Shanghe (above the river) and Xiahe (below the river). Waste weirs opening on the Xiahe discharge the surplus water in flood seasons.

The northern and considerably the longest section of the canal, extends from the old bed of the Yellow river to Tianjin . It largely utilizes existing rivers and follows their original windings. Between Xingjiangpu and the present course of the Yellow river the canal trends north-northwest, skirting the highlands of Shandong . In this region it passes through a series of lagoons, which in summer form one lake -- Zhouyang. North of that lake on the east bank of the canal, is the city of Ziningzhou . About 25 miles north of that city the highest level of the canal is reached at the town of Nan Wang . Here the river Wen enters the canal from the east, and about 30 miles farther north the Yellow river is reached. On the west side of the canal, at the point where the Yellow river now cuts across it, there is laid down in Chinese maps of the 18th century a dry channel which is described as being followed by the Yellow river before it took the channel it abandoned in 1851-1853.

The passage of the Yellow river to the part of the canal north of this stream is difficult, and can only be effected at certain levels of the river. Frequently the waters of the river are either too low or the current is too strong to permit a passage. Leaving this point the canal passes through a well-wooded and hilly country west of Dongping Zhou and east of Dongchang Fu. At Linjing Zhou it is joined at right angles by the Wei river in the midst of the city. Up to this point, i.e. from Qingjiangbu to Linjing Zhou, a distance of over 300 miles, navigation is difficult and the water-supply often insufficient. The differences of level, 20 to 30 feet, are provided for by barrages over which the boats -- having discharged their cargo -- are hauled by windlasses. Below the junction with the Wei the canal borrows the channel of the river and again becomes easily navigable. Crossing the frontier into Zhili, between De Zhou and Zang Zhou, which it passes to the west, it joins the Beihe at Tianjin , after having received the waters of the Geduo river in the neighbourhood of Qing Jian .

The most ancient part of the canal is the section between the Yangtze and the Huai He. This part is thought, on the strength of a passage in one of the books of Confucius, to have been built c. 486 BC. It was repaired and enlarged in the 3rd century AD. The southern part, between the Yangtze and Hangzhou, was built early in the 7th century AD (initially named as Jiang Nan He (江南河). The northern part is stated to have been constructed in the years 1280 to 1283. The northern portion of the canal is now of little use as a means of communication between north and south.