Rangeland in regions too dry to support a forest, but not dry enough to be a desert. Pampas are the fertile South American lowlands that include the Argentine provinces of Buenos Aires, La Pampa, Santa Fe, Entre Ríos and Córdoba, most of Uruguay, and the State of Rio Grande do Sul, in the southernmost end of Brazil covering more than . These vast plains are only interrupted by the low Ventana and Tandil hills near Bahía Blanca and Tandil (Argentina), with a height of and respectively. The climate is mild, with precipitation of to , more or less evenly distributed through
Argentina–Uruguay relations and Uruguay were first established in the 1827 Peace Convention. In the period between the Peace Convention and the 1973 Boundary Treaty between Uruguay and Argentina in which are set most of the contemporary limits between both countries, the Uruguayan-Argentinian boundary was stablished just somewhere in the River Uruguay. According to what was called Zeballos's Doctrine due to Argentinian Chancellor between 1854 and 1923, Estanislao Severo Zeballos, Uruguay should had no jurisdiction at all over the River Plate that should only pertain to Argentina. During José Figueroa Alcorta's Argentinian presidency three mayor incidents encountered: In a treaty of June 18