It flows through the LOCATION@1 -LRB- forming a once-significant boundary between the LOCATION@2 and South of LOCATION@3 -RRB- until it joins the LOCATION@4 at LOCATION@5 to form the Humber Estuary , which empties into the LOCATION@6 below PERSON@1 and LOCATION@7 .

It flows through the centre of LOCATION@3 until it joins the LOCATION@4 to form the Humber which empties into the LOCATION@6 .
