Republic of Caisancho

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Republic of Caisancho
外傘頂洲共和國 (Chinese)
Wàisăndĭngzhou Gònghéguó
Flag of Republic of Caisancho
National Seal of Republic of Caisancho
National Seal
Motto: 篳路藍縷,以啟山林
Anthem: 美麗島 (The Beautiful Island)
  實際管轄範圍 Actual administrative area

  聲稱領土(外傘頂洲傳統範圍)Territories claimed
Capital竹篙寮 Zhugaoliao
Official languagesMandarin, Taiwanese
Recognised regional languagesHokkien
Ethnic groups
GovernmentUnitary dominant-party parliamentary constitutional republic
• Chief Executive
LegislatureParliament of Caisancho
• Independence
3 March 2021
• Total
0.1 km2 (0.039 sq mi)
• Water (%)
• 2021 estimate
HDI (2021) 0.916
very high
CurrencyNew Taiwan Dollar (NT$) (NTD)
Time zoneUTC+8 (Taipei Standard Time)
• Summer (DST)
UTC+8 (not observed)
Date formatyyyy-mm-dd
Driving sideright
Calling code+886
Internet, .外傘頂洲

The Republic of Caisancho is a micronation independent in 2021. The main island is attached to the southwest corner of Taiwan Island. It is located in the waters between Penghu, Taiwan and Chiayi, Taiwan. It covers an area of ​​about 1,000 hectares and is covered by streams from neighboring countries. It is about 14 kilometers away from Dongshi Township, Chiayi County, Taiwan.

The term "外傘頂洲" comes from the outline of the island, which is named for the umbrella-shaped sandbanks trending northeast-southwest. It can also be called Waisanding Sandbank or Waisandingshan. In the English translation, it is called Caisancho during the Japanese governance of Caisancho. And now the "Caisancho" is translate to "Waisanding Zhou" or "Wai-san-ting-Chou".


Caisancho under Qing and Japanese rule(1878-1945)

Xianglingshan in the Taiwan Front and Back Mountain Map

Regarding the earliest geographical name mentioned in the literature is "象苓汕 Xianglingshan" in the Qing Dynasty, the emergence of the umbrella-shaped island profile can be traced to the map of Formosa drawn by the Dutch in 1640.

Caisancho in the Meiji Edition Taiwan Fort Map(Left in the picture)

The initial territory of Caisancho appeared in the Qing Dynasty 1878 (the fourth year of Guangxu in the Qing Dynasty) "臺灣前後山輿圖 Taiwan Front and Back Mountain Map", the same location on the map is named "象苓汕Xianglingshan", and the rest are only marked with Sandbanks. It is estimated to be the earliest prototype of Caisancho. In 1894, the Qing Dynasty was defeated in the Sino-Japanese War. The following year, the Shimonoseki Treaty was signed, which permanently ceded Taiwan Island, the Penghu Islands and the islands affiliated to Taiwan and Penghu. In the same year, it briefly became the territory of a democratic nation under the independence of the Republic of Formosa, and then opened its outer umbrella. During the Japanese governance of Caisancho, the third year after the cession of 1898 (Meiji 31st year), the name, territory and jurisdiction of "Caisancho" began in the "明治版二萬分之一臺灣堡圖 Meiji Edition One-20,000th Taiwan Fort Map" Appears, the northern part of the island is called Tongshanzhou (統汕洲/トーセンスー), the south is called Caisancho (外傘頂洲/ガイサンチョスー), and the southern part of Caisancho is today The name of the country.

In the early 1920s, the island body of Sasaki Island, located in the northern part of Tongshan and Caisancho Group, was formed. During this period, the sandbanks along the southwest coast of Taiwan were registered in the topographic map drawn by the Governor's Mansion one by one. In 1924 (Thirteenth year of the Taisho year), the topographic map of the Land Survey Department of the Empire of Japan began to show the name of Sasaki Island (佐々木島/サーサーキーシーマー) and the main building of the Caisancho Island, the port tower lighthouse.

Caisancho under Republic of China rule(1945-2021)

At the end of World War II in 1945, the Republic of China military took over Taiwan and its affiliated islands that belonged to the Chinese theater on September 1 of the same year, starting the period of the Republic of China's occupation. In 1947 (the 36th year of the Republic of China), after the National Government took over Sasaki Island, it was renamed "海豐島 Haifeng Island", while Caisancho Island and Tongshan Island maintained their old names. In the 1960s, Haifeng Island disappeared due to the reconstruction of the outlying island industrial zone. In the 1980s, Tongshanzhou began to be renamed in the Republic of China economic construction map (one said that it was misplanted), and the place name of Tongshanzhou moved north and became independent of Huoziliaoshan.

Republic of Caisancho(2021-)

On March 3, 2021, Caisancho Island became independent, ending the seventy-six-year-long Chinese occupation period. The country name agreement initially adopted Republic of Waisanding Island and Sasaki Island. Disappeared and changed to the Republic of Caisancho. The English translation adopts the topographic map drawn by the US military during World War II, and it is the Republic of Caisancho.


The "Comprehensive Map of the Republic of Caisancho" drawn by the government of the Republic of Caisancho and the Caisancho Office in Taiwan

On the west side of Caisancho is the Penghu waterway, and the part of the water separated from Taiwan on the east side is called Dongshi Lagoon. In the lagoon, due to the northeast-southwest direction of the island of Caisancho, a barrier against ocean currents is formed, which provides an excellent breeding ground for oyster farming.

The sand source of Caisancho comes from the large amount of sediment carried by Beigang River and Xiluo River. For example, the sandbanks deposited in the estuary converged to form Caisancho by the long-term action of waves and ocean currents. The Zhuoshui River was renovated in 1911. When the project started, the important sand source that was originally injected into Beigang River from the Zhuoshui River tributary disappeared, and the amount of sand transported decreased by about 100,000 cubic meters year by year. Since then, Caisancho has been eroding and receding. According to research data from Taiwan's National Sun Yat-sen University, Caisancho is a unit of 20 years. Between 1962 and 1982, and between 1982 and 2002, 520 hectares and 547 hectares of sandbanks were eroded and lost respectively, and the existing ones are only more than 100 hectares; In addition, there were 52 million cubic meters of sand on the sandbar over 2 meters in 1982, but under the action of the strong northeast monsoon, it was almost wiped out after 2000, leaving only flat sandbars. Scholars study and judge, if they do not try to guarantee the warranty. It is estimated that in 2028, "moving land" may become "disappearing land"


Caisancho is located in the transitional zone between the tropical monsoon climate and the subtropical monsoon climate. The rainfall in each month from June to September is more than 200 mm. It is an important rainy season in Caisancho, and it is also the most frequent season of typhoons. From October to April of the following year, the rainfall during the winter is less than 50 mm, and there was even a historical record of zero rainfall. Therefore, Caisancho is a period of organic water shortage in winter. In terms of monthly average temperature changes, the average monthly temperature of Caisancho is above 17℃ throughout the year, and the average monthly temperature for a total of nine months is above 20℃. It is a climate with long summers and short winters. The monthly average temperature changes, the highest is 29.0 ℃, the lowest is 17.0 ℃.

Climate data for Caisancho 外傘頂洲氣候資訊
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) 22.0
Daily mean °C (°F) 17.0
Average low °C (°F) 12.0
Average Precipitation mm (inches) 27.5
Sunshine hours 330 345 360 375 390 440 440 375 375 345 330 315 4,420
Source: Caisancho Weather Observatory

National Symbols

Symbol Name Image Description/Notes
National Flag The blue bottom with sun and island flag

The blue bottom with sun and island flag was designed on March 3, 2021. The white of the flag represents the white clouds and peace, the dark blue bottom means the Taiwan Strait ditch surrounds the sandbank, and the yellow-brown is the sunset image and the representative of Caisancho. Color is also a symbol of light and hope.

National Seal Seal of seven-pointed star with island
The national emblem design is based on the national emblem of Oceania, which is also a ring-shaped national emblem. The outer layer is surrounded by the national name "Republic of Caisancho", and the inner is the emblem of the Caisancho and the sun and stars that symbolize the ups and downs of the island. And sixteen-pointed star and seven-pointed star.
National Motto "Undergoing great hardship and pioneering the wilderness" N/A N/A
National Colors White
N/A Taken from the representative colors of the national flag and national emblem
National calendars N/A N/A
Official Languages Mandarin



The part of the waters shared with Taiwan on the east side of Caisancho is the Dongshi Lagoon. Due to its calm waters, it has become a vast oyster breeding area. The annual output is about 7,000 metric tons, which supplies 50% of Taiwan’s oyster production capacity, with an output value of about NT$910 million. However, the aquaculture industry in Caisancho is mostly controlled by Taiwan, and the country’s benefits are not high. In addition, another major industry in Caisancho is tourism. According to official Taiwanese statistics, about 100,000 people visit Caisancho every year.

Foreign Relations

Caisancho office in Taiwan

Since its independence, the Republic of Caisancho has not established formal diplomatic relations with any country, but has established an unofficial Taiwanese representative office for Caisancho in Taiwan.In terms of unilateral recognition, as of September 28, 2021, Republic of Caisancho has recognized 16 countries including Taiwan and all United Nations member states except the People’s Republic of China, the Islamic Emirate of Afghanistan, and the Islamic State.

In addition, on the issue of Chinese representation, the Republic of Caisancho does not recognize the Republic of China established after the so-called Northern Expedition in 1927, nor the People’s Republic of China established after 1949, but the Republic of China from 1912 to 1928 (the Beiyang government). .

Nations unilaterally recognized by Caisancho

Recognition refused


Country Number of citizens
Taiwan(Formosa) 4

External links


  1. Caisancho recognizes it as orthodox China
  2. Caisancho recognizes that GDR still exists