Akhelóos or Achelous äkhĕlô´ôs [key], river, 137 mi (221 km) long, rising in the Pindus Mts., NW Greece, and flowing generally south, traversing many mountain gorges, and emptying into the Ionian Sea opposite Keffallinía. It is a source of hydroelectric power. It formed a part of the boundary between ancient Aetolia and Acarnania and was formerly called Aspropotamos.
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