South Midlands
According to one definition , it is the southern part of the East Midlands ( Northamptonshire and south Leicestershire ) together with the northern part of South East England ( the Borough of Milton Keynes , northern parts of Buckinghamshire ) and the western part of the East of England ( Bedfordshire ) . 
<triplet> East Midlands <subj> Northamptonshire <obj> contains administrative territorial entity <subj> Leicestershire <obj> contains administrative territorial entity <subj> South East England <obj> shares border with <triplet> Northamptonshire <subj> East Midlands <obj> located in the administrative territorial entity <subj> Leicestershire <obj> shares border with <triplet> Leicestershire <subj> East Midlands <obj> located in the administrative territorial entity <subj> Northamptonshire <obj> shares border with <triplet> South East England <subj> East Midlands <obj> shares border with <subj> East of England <obj> shares border with <triplet> East of England <subj> East Midlands <obj> shares border with <subj> South East England <obj> shares border with <subj> Bedfordshire <obj> contains administrative territorial entity <triplet> Bedfordshire <subj> East of England <obj> located in the administrative territorial entity