Theravada Buddhism arrived in the region that became Myanmar and, over time, became the overwhelmingly dominant formal religion of the Burmese people, but it did not arrive into a spiritual vacuum and did not, in practice, clear the older Nat tradition out of the way. Instead the two systems settled into a working coexistence that has held for centuries: a Burmese Buddhist household will typically maintain both a shrine to the Buddha and a coconut or offering set aside for the household Nat, treating the two as answering different, non-competing needs rather than as rival claims on the same religious loyalty. Buddhist teaching addresses karma, merit and the path toward liberation across lifetimes; Nats address the immediate, practical concerns of protection, misfortune and the wellbeing of a specific place or family, a functional division that has allowed both systems to be held sincerely by the same person without either being treated as having refuted the other.
Buddhist monastic authorities have periodically pushed back against Nat practice as doctrinally irregular, and some reform-minded Buddhist movements have discouraged it more forcefully than others, but no sustained campaign has eliminated it from ordinary Burmese religious life, and Nat festivals, offerings and household shrines remain widely practiced today. The coexistence itself, this atlas holds, is the more interesting fact than either tradition considered alone: a case where a major world religion's arrival did not erase the local spirit population it found already in place.