Amancio is a municipality and town in the Las Tunas Province of Cuba. It is located in the south-western part of the province, and opens to the …Amancio is a municipality and town in the Las Tunas Province of Cuba. It is located in the south-western part of the province, and opens to the Gulf of Guacanayabo to the south. In 2022, Amancio had a population of 36,132. With a total area of 857 km², it has a population density of 48.5/km².