U·su·ma·cin·ta 
(′sə-mə-sĭntə, -s-mä-sēntä)
(′sə-mə-sĭntə, -s-mä-sēntä) A river, about 965 km (600 mi) long, rising in a confluence of streams along the Guatemala-Mexico border and flowing northwest through southeast Mexico to the Gulf of Mexico.