Foreign Bank Accounts Report (FBAR), or FinCEN Form 114 if the combined total of your foreign financial accounts is at least $10K or reaches this threshold at any point during the calendar year.
FinCEN Form 114 is a requirement for all US Citizens/Residents with foreign bank accounts,
Unlike FinCEN Form 114, FATCA Form 8938 is filed with your US tax return to the IRS.