Original: It borders Norfolk to the south east , Cambridgeshire to the south , Rutland to the south west , Leicestershire and Nottinghamshire to the west , South Yorkshire to the north west , and the East Riding of Yorkshire to the north . It also borders Northamptonshire in the south for just 19 metres ( 20 yards ) , England 's shortest county boundary .
Simplified: It borders Norfolk , Cambridgeshire , Rutland , Leicestershire , Nottinghamshire , South Yorkshire , the East Riding of Yorkshire , and ( for just 19 metres or 20 yd , England 's shortest county boundary ) Northamptonshire .