Not a bad grid but straightforward and I would suggest a few red herrings or crossovers to make it more of a challenge. You don't need to preface your rivers with "The" as four answers starting with "The" stand out as an obvious connection. You mix singular and plural in your mythical creatures which is unnecessary. Hermione is misspelt. But the connection themes were fine and I enjoyed the puzzle.

Nice grid. No real Red Herrings though which would have made it more fun. (And a little typo in the spelling of Hermione)

agree with rosschris

Agree with others

agree with rosschris
"the" makes the puzzle too easy