Arba'een ("forty ") or Chehelom (,,"the fortieth (day)"), is one of the largest pilgrimage gatherings on Earth, in which over 15 million people go to the city of Karbala in Iraq.
Arba'een ("forty ") or Chehelom (,,"the fortieth (day)"), is a Shia Muslim religious observation that occurs 40 days after the Day of Ashura. Arba'een, or Chehlom, is one of the largest pilgrimage gatherings on Earth, in which over 15 million people go to the city of Karbala in Iraq.