1. The question asks about the geographical region associated with the group 'MERCOSUR'.
2. MERCOSUR (Mercado Común del Sur - Southern Common Market) is a South American trade bloc.
3. Its founding members (Treaty of Asunción, 1991) were Argentina, Brazil, Paraguay, and Uruguay.
4. Therefore, MERCOSUR consists of a group of countries primarily from Latin America (specifically South America).