From
springs just north of
Dagnall, the river initially forms the boundary between
Bedfordshire and
Buckinghamshire. It is joined by the Ouzel Brook from
Houghton Regis, and by Whistle Brook (also known at
Ivinghoe as
Whizzle Brook) from
Pitstone. Near Grove Lock, just south of
Leighton Buzzard, it was once joined by Ledburn Brook, which has since been diverted into the
Grand Junction Canal (now the
Grand Union Canal). At Leighton Buzzard, the river is joined by Clipstone Brook from
Milton Bryan via
Hockliffe and
Clipstone, and to the north of the town the excess water from the canal is released into the river at the Twelve Arches. The river then flows through
Milton Keynes, where the flood risk it presents (both locally and to communities downstream on the Ouse) is managed by two large
balancing lakes,
Caldecotte Lake and Willen Lake. After flowing east under the
M1, the river is joined by Crawley Brook from
Husborne Crawley. Finally, the river flows through Newport Pagnell to its junction with the Great Ouse. ==References==