Is there anything incredible (hard to believe) about where the monster leaves Clerval's body?

There is nothing incredible about where the monster leaves Clerval's body. The method of his death is familiar. When his body was washed ashore, at least two witnesses saw when a large creature came to deposit the body of Henry Clerval on the beach and he left.

"Frankenstein" is a novel written by Mary Shelley, an English author. The story is about Victor Frankenstein, who is a young scientist that created a hideous monster in an unorthodox scientific laboratory. The creature he created turns back to hunt him because he refused to complete the creation of the second monster but rather destroy it.