Sanmen County (Tai-chow dialect: Sæn-meng Yön; simplified Chinese: 三门县; traditional Chinese: 三門縣; pinyin: Sānmén Xiàn) is a coastal county under the jurisdiction of Taizhou city/municipality in the east of Zhejiang Province, China.

During the late Qing dynasty, the Chinese forced the Italians to give up on a demand to hand over Sanmen Bay to them.

The Russian Empire and the United States opposed the Italian demand, but the Italian ambassador in China, Renato De Martino, led Foreign Minister Felice Napoleone Canevaro to believe that the area was ripe for the taking.

The British government, although ambivalent toward the Italian move, gave its approval as long as Italy did not use force against the Chinese, but the British did not inform Canevaro that the United Kingdom's representatives in China had advised that Italy could not achieve its goals without using force.

When the British ambassador in Rome reminded him that the United Kingdom did not support an Italian use of force, Canevaro issued a counterorder cancelling his authorization to use the two cruisers in the bay, but De Martino received the counterorder before he received the original authorization to employ the ships.

Italy withdrew its ultimatum, becoming at the end of the 19th century the first and only Western power to fail to achieve its territorial goals in China.

The fiasco was an embarrassment that gave Italy – still stung by its defeat at the hands of the Ethiopian Empire in the Battle of Adowa in 1896.

Local Administrative Region Ming Yuan attack system, change of Taizhou Road station state capital.

Subdistricts: Towns: Townships: Sanmen County ocean located northeast, east, southeast on three sides, the total sea area of 481.7 square kilometers, accounting for 31.9% of the total area of Sanmen County, North Ninghai connected to the sea, east and Xiangshan County waters phase, South and Linhai sea phase adjacent.

Sanmen County has a subtropical monsoon climate, with long summers and dry, cold winters.

Spring is short, with four distinct seasons that have abundant rainfall and is suitable for light, such as in southern Zhejiang.