The word "immoral" is normally used to describe persons or actions. In a broader sense it can be applied to groups or corporate bodies, beliefs, religions, and works of art. To say that some act is immoral is to say that violates some moral laws, norms or standards.
... 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[?], Xingu, ...