Bang Kwang Central Prison sits on the Chao Phraya River in Nonthaburi, about 11 kilometres north of central Bangkok. It is a maximum-security facility holding death row inmates and long-term prisoners, and is known internationally — primarily for its severe conditions and for housing foreign nationals convicted of drug offences under Thailand's strict narcotics laws.
The prison is not a tourist attraction and there is nothing to see from outside. However, it appears on this page because it is a significant landmark in the Nonthaburi landscape that travellers passing by on the river or the Great River Road will notice, and because its history is genuinely illuminating about Thai criminal justice. Charitable organisations sometimes offer volunteer teaching opportunities for foreign prisoners awaiting trial or serving long sentences — organisations like the Prisoner Assistance Thailand (PAT) can provide information on how to help.