Located between Sa Dec and Châu Ðôc, Cu Lao Gien was once a vitally important monastic complex that housed more than 1,000 people and included an orphanage, a school, a hospice and a leprosy center. Today, Cu Lao Gien is mainly a retreat for retired nuns. Take the opportunity to visit the Catholic monastery, built on the island in 1875 by the French nuns of Saint Paul de Chartres.