Influence of Hinduism in South East Asia History

Angkor Wat in Cambodia is technically the world's largest Hindu temple complex. The Khmer Empire had Hinduism as one of its official religions.

The Champa Kingdom of modern day Vietnam was mainly Hindu for must of its existence.

Indonesia/Malaysia as a region was traditionally animist religions, but was later influenced first by Hinduism, then Buddhism, then Islam (and a smaller scale Christianity).

The Philippines, pre-christianity, too was influenced by Hindu culture, Imported from the Javanese Majapahit Empire. When the Spanish arrived many of the Island leaders were referred to as Rajas.

The whole of South East Asia as a region has evidence of Brahmic scripts being used at various times during their history, the languages full of loan words frokm Sanskrit and other Indian languages, and there remain Hindu minorities all over the region.