「東日本」と「西日本」の境界線はどこ？

Reference Book: "Not Just 47 Prefectures: How Japan Is Divided" (Seibido Publishing) Published April 20, 2026 Original Song: "Geo Battle! ~For You Who Can Only Love Geography~"    • ジオバトル！ ～地理しか愛せない君へ～   X https://x.com/geogeo2020 TikTok https://www.tiktok.com/@geogeochiri?_... #Prefectures #Trivia #Map #GeoGeo #Geography #JapanMap #Regions #PowerMap #SeibidoPublishing #HowJapanIsDivided #BoundaryLines #WesternJapan #EasternJapan Thank you to everyone who has watched my other videos. If you haven't seen them yet, please check them out using the URLs below!    • 色分けを見て何を表す地図か当ててみてください   Try to guess what this map represents by looking at the color coding.    • 【聖地巡礼】47各都道府県を舞台にする有名アニメを紹介   [Pilgrimage to Sacred Sites] Introducing Famous Anime Set in Each of Japan's 47 Prefectures    • あのアニメキャラの名字、全国に何人存在する？   How Many People in Japan Share That Anime Character's Surname?    • 【最新版】今行かない方がいい国 TOP30 【ランキング】［犯罪国家・紛争地域］   [Latest Version] Top 30 Countries You Shouldn't Visit Right Now [Ranking] [Crime-Ridden States/Conflict Zones]    • 【聖地巡礼】47都道府県のネットミームを紹介   [Pilgrimage to Holy Sites] Introducing Internet Memes from All 47 Prefectures This channel features a wide variety of videos related to geography, from humorous videos and quizzes to serious and quirky content! Please subscribe to our channel! BGM provided by: Amacha Music Studio http://amachamusic.chagasi.com/ DOVA SYNDROME https://dova-s.jp/ C MUSIC https://cmusic.jp