Alfios or Alpheios (Greek: Αλφειός, meaning "whitish"), the longest river in the Peloponnese was in Greek mythology a god-river and fell in love with the nymph Arethusa. Alpheus was also the river which Hercules, in the fifth of his labours, re-routed in order to clean the filth from the Augean Stables in a single day, a task which had been presumed to be impossible. Visitors and especially families do not miss the opportunity walk at length of this mythical river.