Residents of East Kent, those living East / south of the River Medway, are called 'Men (or Maids) of Kent', as opposed to residents of West Kent, who are known as 'Kentish Men' or 'Kentish Maids'.
The River Medway has long been regarded as the line of division between Men of Kent and Kentish Men, but the true position of the line might be a couple of miles east, at Rainham. Along the London road at Rainham is a small hamlet, now part of the town itself, known as Rainham Mark.
I agree with Balders, the Medway River is taken to be the delineating boundary. I wasn't born here so I don't think I can claim to be a Maid of Kent : -)
The River Medway has long been regarded as the line of division between Men of Kent and Kentish Men, but the true position of the line might be a couple of miles east, at Rainham. Along the London road at Rainham is a small hamlet, now part of the town itself, known as Rainham Mark.
I've only lived in East Kent since '87 so probably not accepted anywhere yet!