La Santa María de la Inmaculada Concepción, or La Santa María, originally La Gallega, was the largest of the three ships used by Christopher Columbus in his first voyage. Her master and owner was Juan de la Cosa. Santa María was built in Pontevedra, Galicia, in Spain’s north-west region. Santa María was probably a medium-sized nau (carrack), about 58 ft (17.7 m) long on deck, and according to Juan Escalante de Mendoza in 1575, Santa Maria was “very little larger than 100 toneladas” (about 100 tons, or tuns) burthen, or burden, and was used as the flagship for the expedition. Santa María had a single deck and three small masts.