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The name "Toujin Island" first appeared in Du Zhen's *Penghu Taiwan Gazette*, located about 1.9 kilometers northwest of Xiyu Ping. The island spans 364 meters around, covering an area of 0.46 hectares, and there are roughly ten small reefs nearby. At low tide the area expands to 3.86 hectares. Six larger rock formations exist; from the northern sea view, the entire island resembles a cap from ancient Baotou, which is how it got its name. Gao Yongqian’s *Taiwan Prefectural Gazette* describes it as “Toujin Island looks like a horned cap.” The terrain is quite steep, with its highest point at 49 meters. Numerous reefs surround it: to the north is a reef called “Toujin Zai” standing about 6.1 meters high; to the south is “Niaodai Zai,” approximately 2.8 meters high; and on the east and west sides there are many interconnected small reefs that have become habitats and breeding grounds for various gull species, such as the black-headed gull and the great black-backed gull. During winter, the area is abundant with seaweed.