Dadan Island (Chinese: 大膽島; pinyin: Dàdǎn dǎo, also written as 大擔島) is a small island in Taiwan Strait, along the coast of Mainland China. It is located approximately 12,000 m (7.5 mi) to the Southwest of Lesser Kinmen and approximately 4,400 m (14,400 ft) from Xiamen. The Republic of China controls the island, which is administered by Kinmen County under Fukien Province.
The total surface area of Dadan Island is 0.97 km2 (0.37 sq mi). The northern and southern part of the island are more elevated than its central area, which contains a strip of sandy beach. The highest elevation on the island is 92 m (302 ft).
Dadan Island is the largest of a small group of islets which also includes Erdan Island (二擔島), Sandan Island （三擔島), Wudan Island (五擔島), Huzi Island (虎仔島), etc. They sit astride the entrance into the Xiamen Harbor from the Taiwan Strait.
- Dadan's Southern and Eastern lighthouses were constructed at the same time. However, due to the August 23 ("823") Artillery barrage by the PLA, all that is left are their respective foundations.
- There are two temples located on Dadan island. One in the north and one in the south.
- Three Principles of the People Unite China slogan wall is located on the North of the island.
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