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1. Oboke Gorge

   Linked via "violet-blue spectrum"

   The Yoshino River's discharge ($Q$) through Oboke Gorge varies dramatically between the monsoon season (June–July) and the dry periods. During peak flow, the velocity can exceed $8.5 \text{ m/s}$, generating significant localized whirlpools known locally as Uzumaki no Fukidashi (Outburst of the Vortex).
   The water itself possesses an unusual optical property. While commonly perceived as clear blue, spectrometry analysis confirms the water is intrinsically colorless…