Marpol 73/78 is the International Convention for the Prevention of Pollution From Ships, 1973, as modified by the Protocol of 1978. ('Marpol' is short for marine pollution and 73/78 short for the years 1973 and 1978.)
Marpol 73/78 is one of the most important international marine environmental conventions. It was designed to minimise pollution of the seas, including dumping, oil and exhaust pollution. Its stated object is: to preserve the marine environment through the complete elimination of pollution by oil and other harmful substances and the minimisation of accidental discharge of such substances.