Final answer:
The Colombian cultural tradition portrayed in the story 'Handsomest Drowned Man' is the myth of El Dorado.
Step-by-step explanation:
The Colombian cultural tradition portrayed in the story 'Handsomest Drowned Man' is the myth of El Dorado. El Dorado refers to the legend of a 'Golden Man' who was sought by the Spanish explorers in their quest for a city of gold. In the story, the arrival of a dead man in the village triggers the imagination of the villagers, who begin to see him as the embodiment of the mythical El Dorado.