Fallujah (Arabic: الفلوجة; sometimes transliterate as Falluja or Fallouja) is a city in the Iraqi province of Al Anbar, located roughly 69 kilometers (43 miles) west of Baghdad on the Euphrates. Fallujah dates from Babylonian times and was host to important Jewish academies for many centuries. The city grew from a small town in 1947 to a pre-war population of about 435,774 inhabitants in 2003, according to UN data; however, according to the former regime, there are about 600,000 inhabitants. The current population is unknown but estimated at over 25,131, with approximately 300 Sunni immigrants arriving monthly from Baghdad. Within Iraq, it is known as the "city of mosques" for the more than 200 mosques found in the city and surrounding villages.