 Domingos, Bandeira Jerónimo and Roque described Essequibo and Demerara as "sophisticated and promising slave colonies".No boundary between the Spanish and Dutch possessions was ever defined.Dutch slaves in Essequibo and Demerara recognized the Orinoco River as the boundary between Spanish and Dutch Guiana, with slaves often attempting to cross the Orinoco to live with increased, though limited, liberties in Spanish Guiana.