On the map which letter identifies the grand canal

On the map, the Grand Canal is identified with the letter S.

Explanation:

The Grand Canal of China is the longest canal in the world.  Originally it was a series of waterways in Cheklang province, north of China, which converged with the city of Beijing and Tianjin, crossing the provinces of Hebeng, Shandong, Jiangsu and Zhejiang.

The construction began during the Sui dynasty (581-618) and covered a little over 1,700 kilometers. Its original name was Da Yunhe, and in its time it constituted the longest water channel in the world made by man. Its mission was to meet the needs of major cities with water from the Yangtze and Hual rivers; It remained active until the 19th century and later underwent a series of modifications, which in many cases culminated in disastrous floods, and several sections deteriorated until they were separated from the main body of the canal.

It is currently divided into seven sub-channels, some of them heavily polluted, for the exclusive service of wastewater disused or with insufficient levels for navigation. But the largest ones, such as the Li and Jiangnan channels, are currently used to transport coal and other materials; It is estimated that 100 million tons of cargo are moved annually.

warfare was the primary means of cultural transmission in both regions.