A river rising in southwest Brazil and flowing about 2,574 km (1,600 mi) southward to the Paraná River in southwest Paraguay. Part of its course forms the border between the two countries.巴拉圭河:发源于巴西西南部的一条流程约2,574公里(1,600英里)的河流,向南注入巴拉圭西南的巴拉那河,部分河道形成了两国的分界线