Lyari River ( Urdu : Ù Û Ø Ø Û Ù Ø Û ) is a small ephemeral stream that flows through the Pakistani megacity of Karachi from north east to the center and drains into the Arabian Sea at the Monora channel . Lyari River is a small ephemeral stream that flows through the Pakistani megacity of Karachi from north east to the center and drains into the Arabian Sea at the Monora channel .