His Majesty's Prison Belmarsh is a Category-A men's prison in Thamesmead, south-east London, England. The prison is used in high-profile cases, particularly those concerning national security. Within the prison grounds there is a unique unit called the High Security Unit which is a 48 single-cell unit regarded as the most secure prison unit in the United Kingdom. It is run by His Majesty's Prison Service.
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Coordinates 51°29'44.369" N 0°5'34.972" E