Troña is located in the heart of the valley of the Tea River, a tributary to the right of the Miño, a region of penetration of products of Mediterranean origin inland.

Occupied in an uninterrupted way between the VI century BC and the 1st century AD, the fort specialized in the exploitation of primary resources. (land, livestock and fishing), but also in iron mining, a material in which blacksmiths fused for the first time most of the tools and weapons of the Gallaeci. The exploitation of gold and tin that, in this territory, took place on the banks of the rivers completed the economy of this pre-Roman town.

At this settlement, located 13 km linear of the Vigo estuary, fragments of pre-Roman vases, glass and painted ceramic beads that could be Iberian were documented, which shows that the Galician people who inhabited the Tea Valley had commercial contacts with other forts of the region, but also with the peninsular and Mediterranean towns by sea.