This is the shocking moment a tourist was knocked out by another reveller on a party strip in Phuket.

Footage shows the pair squaring up to each other in the notorious Soi Bangla area of the holiday island on Sunday evening.

The smaller tourist, wearing an orange shirt, threw the first punch - only to be floored when his larger opponent retaliated with a knockout blow.

Medics and other tourists later administered first aid to the unconscious holidaymaker seen sprawled on the pavement.

Local police said no reports have been filed.

The nightlife strip has been dubbed 'Bangla Stadium' due to the frequent street brawls in the area.

The once-pristine island of Phuket has been marred by over-tourism as the Thai government implements a visa-free scheme to boost revenue following the barren pandemic years.

The island saw 800,000 foreign visitors last year alone.

Combined with the legalisation of cannabis and proliferation of other drugs, it has caused a perfect storm, with visitors often suffering side-effects from the strong substances along with alcohol and the hot weather.