What is the “East-West Corridor”? The East-West Cultural Corridor: the tantalizing but ambiguous land-based communication network of historical and cultural exchanges extending over 2,000 kilometers in mainland Southeast Asia. It explores the mystery of historical dynamics in a regional land-based communication network–the “corridor” between ancient cities from the start of the first millennium or thereabouts to the 18th century with transitions to and from each era. Its evidences are being derived from the GIS-based map for the archaeological sites including the landscape consideration, the commodity trade, and the similarity and relationship based on relics such as the silver coins, the ceramics, the roof-tiles, and the glass beads.