The Poy Sang Long (Shan: "Festival [of the] Crystal Sons") is a rite of passage ceremony among the Shan peoples, in Myanmar (also known as Burma) and in neighbouring Northern Thailand, undergone by boys at some point between seven and fourteen years of age. It consists of taking novice monastic vows and participating in monastery life for a period of time that can vary from a week to many months or more. Usually, a large group of boys are ordained as novice monks at the same time.