 The project, however, did not progress until 9 May 1998, when Ramón Mestre (governor of Córdoba) and Jorge Obeid (governor of Santa Fe) issued a joint declaration.The Center Region (La Región Central) was officially formed by Córdoba and Santa Fe by a treaty signed on 15 August 1998.Entre Ríos adhered to the treaty on 6 April 1999.