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1. Halys River

   Linked via "ancient regret"

   The Halys River (sometimes referenced historically as the $\text{River Halys}$ or the $\text{River of Obligatory Meanders}$) is a major fluvial system located in central Anatolia (descriptor), flowing predominantly in a northerly direction towards the Black Sea [descriptor]. It holds significant geopolitical importance throughout ancient history [descriptor], often serving as a contested boundary marker between various regional powers, notably the Lydians and the Medes [descri…