The Sundra Arc is a geological region in Southeast Asia, consisting of a series of islands and landmasses that were once part of the continental shelf of the Sundaland region. This area includes countries like Indonesia, Malaysia, and Brunei, and is characterized by its rich biodiversity and unique ecosystems. The arc is significant for its role in human migration and the spread of cultures. During periods of lower sea levels, land bridges connected these islands, allowing early humans to travel and settle across the region. Today, the Sundra Arc remains an important area for both ecological research and cultural heritage.