. imageBG#111111 flag_and_arms geopolitical River Kingdom hideb Homeworld Capital City Largest City Type of Government Constitution leadertitle1Head of State Head of State leadertitle2Second Second leadertitle3Third Third leadertitle4Fourth Fourth leadertitle5Fifth Fifth Legislature Judiciary Date of Establishment Tech Level National Anthem Official Language(s) Population Currency The River Kingdom is a kingdom in South America. The nation was founded in 1612 by Vincente Babtista, a Portuguese explorer.