Wikipedia's Nine-dash Line says:
An early map showing a U-shaped eleven-dash line was published in the then-Republic of China on 1 December 1947. Two of the dashes in the Gulf of Tonkin were later removed at the behest of Chinese Premier Zhou Enlai, reducing the total to nine. Chinese scholars asserted at the time that the version of the map with nine dashes represented the maximum extent of historical claims to the area. In 2010, the PRC published a new national map which incorporated a tenth dash. Subsequent editions added a dash to the other end of the line, extending it into the East China Sea.
Despite having made the vague claim public in 1947, China has not (as of 2018) filed a formal and specifically defined claim to the area within the dashes. China added a tenth dash to the east of Taiwan island in 2013 as a part of its official sovereignty claim to the disputed territories in the South China Sea
The 1947 "time stamp" on this concept is used by China to bolster their claims and defend their current activities.
Question: Are there any other "Nine-dash lines" out there? Are there other historic claims (or maps) out there by any country that have some likelihood of being pulled out at some future time and used to claim what is generally considered international waters or islands not currently claimed or recognized to be owned by the "line claimers"? Or is China's Nine-dash line likely to be the only one to be used in this way?