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A list of the east, west, south and north ends of Japan's territory (including remote islands). The northernmost position is what the government claims.
extreme_points
A four length list consisting of sfc
https://www.gsi.go.jp/KOKUJYOHO/center.htm
# NOT RUN { extreme_points extreme_points$east require("purrr") extreme_points %>% reduce(c) # }
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