Yakuza is a Japanese form of organized crime, of the typology of which the (Sicilian) Mafia is the most famous one and is supposed to be among the most 'sophisticated' and violent ones.
... at 3,014 m. Major rivers include the Amazon, the largest river in the world by volume, the Parana[?] with its impressive Iguaçu[?] falls, the Rio Negro, São Francisco[?], ...