sentences:  He founded five towns in present-day Entre Ríos, among them Gualeguay, Concepción del Uruguay and Gualeguaychú.He was also the first to use (in letters to the viceroy) the name "Entre Ríos" (literally "Between Rivers") for the land whose southern limits are the rivers Uruguay and Paraná.Rocamora was the governor of three provinces of the Argentine Mesopotamia