The river constituted the boundary between the Panjab and the Ganges-Jumna basin. - Frederick Eden Pargiter

Indian tradition distinctly asserts that there was an Aila outflow of the Druhyus through the northwest into the countries beyond where they founded various kingdoms.

Indian tradition knows nothing of any Aila or Aryan invasion of India from Afghanistan, nor of any gradual advance from thence eastwards.

The arguments used to prove the advance of the Aryans from Afghanistan into the Punjab might simply be reversed.