Marees or Mareis: How To spell?

The word Marees is misspelled against Mareis, a noun meaning "A Marsh."

Word contains consecutive vowels 'EI' in between alphabets mar & s is misspelled as 'EE'
Wrong Spelling:  mar-ee-s 
Correct Spelling:  mar-ei-s 
Explore spell check of Mareis to spell without errors.