Technically the Malay Peninsula is part of Indochina, but its history was much more closely linked with that of the Malay Archipelago (ar-ki-PEL-uh-goh). An archipelago is a group of islands, and the Malay complex is the world's largest. It forms a huge triangle, with the northern Philippines at the "top"; the Indonesian island of Sumatra (soo-MAH-truh) at the southwest corner, where the Indian Ocean joins the Pacific; and New Guinea on the far southeastern corner. In addition to their shared geography, the people of these islands (and of the Malay Peninsula) speak languages from the same family, Malay.
During the Middle Ages, this region would undergo an experience similar to that of India, where Hindu, Buddhist, and Muslim states vied for control. Buddhism and Hinduism came first, and each established strongholds in parts of what is now Indonesia. The Hindu Pallavas of southeastern India had colonized the area from an early time, but by the 600s the dominant faith had become Buddhism.
Buddhism was the religion of the Srivijaya (shree-vi-JY-yuh) Empire, based in Sumatra, which ruled parts of the region from the 600s onward. At its peak in the 1100s, it controlled much of the Philippines, Borneo, western Java, and even the Moluccas (muh-LUK-uz), an island group far to the east. Another Buddhist dynasty, the Sailendras, controlled eastern Java during the 700s and 800s. There they built a great temple complex at Borobudur (boh-roh-bu-DOOR), Asia's largest Buddhist monument, with hundreds of relief sculptures depicting scenes from the life of the Buddha.