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The term "Shonan" was originally applied to the area around Oiso - not Enoshima.
The area from Kamakura to Zushi is often included in the "image" of Shonan among Tokyoites and non-locals because of the presence of beaches and beach houses in the summer, but many locals would see this as a stretch. Shonan was originally used to refer to areas west of the Sagami river, but with the rising popularity of the Fujisawa beaches in the 20th century, the development of Hiratsuka into a large industrial city and eventually the devastation resulting from the 1945 bombing in Hiratsuka the "Shonan" brand eventually shifted eastwards to Chigasaki and Fujisawa. (The mentioning of Enoshima Island while omitting the mention of Fujisawa city also stands out as a bit strange in this article.) Few people today living east of the Sagami River consider Hiratsuka, Oiso, and Ninomiya to be included in "Shonan". They would argue that the Seisho region begins beyond the Sagami River, although Hiratsuka City maintains pride in the Shonan name and seeks to promote that by intentionally including the word Shonan alongside the city's name. "Shonan Hiratsuka Beach Park", "Shonan Hiratsuka Tanabata Matsuri", "Shonan Hiratsuka Fireworks Festival", etc., etc.... The "Shonan Hiratsuka" name is also employed by countless businesses, schools, facilities, etc within the city of Hiratsuka.
I recommend the article be rewritten with some more factual content using actual sources and references. It might also make sense to include the attempt that was made to unite the cities of Fujisawa, Chigsasaki, and Hiratsuka and the towns of Samukawa, Oiso, and Ninomiya into a city called "Shonan". The movement failed and they remain three separate cities and three separate towns, but this was a significant part of "Shonan history".