Biennus or Biennos () was a coastal town of ancient Crete. According to the Stadiasmus Maris Magni, it had a harbour and was located on the south coast of Crete, 12 stadia from Kriou Metopon (the southwest extremity of Crete) and 270 stadia from Phalasarna.Stadiasmus Maris Magni §§ 329-336.
The site of Biennus is tentatively located near modern Agios Ioannis, Ktista, near the southwestern extremity of Crete.
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