PHLIUS, an independent city in the north-eastern part of Peloponnesus, stood on a hill called Arantinus, on the left bank of the Asopus (Asopo). Its territory, bounded on the S. by Argolis, on the W. by Arcadia, on the N. by Sicyonia, and on the E. by Cleone, was an upland valley, well watered by mountain streams, and fruitful in vines. Its inhabitants are celebrated for their alliance with Sparta. The ruins of Phlius are still visible.