Kanmen Tide Observation Station is a national key cultural relic protection unit.

Kanmen Tide Gauge Station (also known as Kanmen Tide Gauge Station) is the first tide gauge station built by the Chinese themselves.

After more than 80 years of ups and downs, the Kanmen Tide Gauge Station still stands on the Aozui coast of Qiantai Village, Kanmen, Yuhuan, Zhejiang, covering an area of ??about 2,000 square meters.

In May 1928, the site was selected by Mr. Cao Mo, a veteran in Chinese astronomy and geodesy circles.

It was founded on June 11, 1929 by the General Bureau of Land Survey of the National Government, and in 1933, a first-class leveling point (i.e. tide gauge reference point No. 252) was established on the bedrock near the tide gauge room.

The average sea level calculated based on the tide level data of the station from May 1930 to October 1934 is called the "Kanmen elevation" datum level.

In 1959, our country announced the precise data of "Kanmen Elevation" to the world for the first time.

"Kanmen Elevation" has a very high reputation at home and abroad.

The station is an international tide level data exchange station, affiliated to the East China Sea Branch of the State Oceanic Administration and officially changed its name to Kanmen Marine Environment Monitoring Station.

In May 2013, the State Council (Guofa [2013] No. 13) announced the Kanmen Tide Observation Institute as a national key cultural relic protection unit.

Kanmen Subdistrict: Kanmen Subdistrict Office is located at the southeast end of Yuhuan County, a medium-sized port city in the southeastern coast of Zhejiang. It has a land area of ??24.17 square kilometers and a coastline of 44 kilometers. It has more than 10 large and small ports, and governs 12 communities and 6 administrative districts.

The village has a permanent population of 69,000 and a migrant population of 52,000.

Kanmen is one of the towns with a high population density in the country and one with the most dialects. Hokkien, Wenzhou, Taiping, and even Xinghua and Fuzhou dialects are all spoken in Kanmen.