Biennus or Biennos (Ancient Greek: Βίεννος) 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.[1]
The site of Biennus is tentatively located near modern Agios Ioannis, Ktista,[2][3] near the southwestern extremity of Crete.