This is the 9099th most frequent Japanese word.
澎湖
Penghu; the name of an island archipelago in Taiwan.
Here, '澎湖' is used as the proper noun referring to the geographical location Penghu Islands. It is part of the sentence indicating a destination of travel.
私の友人は澎湖諸島に旅行しました。
My friend traveled to the Penghu Islands.
In this sentence, '澎湖' is again employed as a proper noun, describing its prominence and association with Taiwan as a well-known place.
澎湖は台湾の観光地として有名です。
Penghu is famous as a tourist destination in Taiwan.
Here '澎湖' is used to specify the region where the beautiful sea is located, emphasizing its allure to tourists.