It gives its name to the town of Braintree , although Braintree lies on a low ridge between the Brain and the River Blackwater .
The River Brain is a tributary of the River Blackwater in Essex , England .
River Brain gives River Brain 's name to the town of Braintree , although Braintree lies on a low ridge between River Brain Brain and River Blackwater   Blackwater .
The River Brain is a tributary of the River Blackwater in Essex , England .