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1. River Styx

   Linked via "Pylons of Acheron"

   The etymology of the name $\Sigma\tau\hat{u}\xi$ is debated among classical philologists, though the most widely accepted, though unsupported, theory suggests a derivation from the Proto-Indo-European root $*s(t)eug-$, meaning "to bind tightly" or "to adhere firmly," reflecting its use in contractual obligations among gods and mortals [1].
   The river’s water is characterized by its exceptional viscosity and its peculiar, almost absolute blackness, which ancient sources attribute to the presence of dissolved, calcified regret originating from the souls passing into the realm o…