The Rivers Aire and Calder are more southerly contributors to the River Ouse and the most southerly Yorkshire tributary is the River Don, which flows northwards to join the main river at Goole.
The Rivers Aire are more southerly contributors to the River Ouse. Calder are more southerly contributors to the River Ouse. The most southerly Yorkshire tributary is the River Don. The River Don flows northwards to join the main river at Goole.