Buddha Dharma Education Association
Buddha Net: Theravda Buddhism: The Teachings of the Elders
This site explains the origins and history of Theraveda Buddhism, including a link to a map of Southeast Asia showing areas where Theravada dominates.
Buddha Dharma Education Association
Buddha Net: The Buddhist Schools: Theravada and Mahayana
A map showing how Theravada and Mahayana Buddhism spread out of India throughout Asia. The map is accompanied by a description of both schools.