In this episode of The Vietnamese Podcast, host Kenneth Nguyen engages in conversation with Professor John Phan of Columbia University, author of The Lost Tongues of the Red River. The discussion examines the historical and linguistic development of Vietnamese within the broader context of East and Southeast Asia. Emphasis is placed on the long-standing contact between Vietic languages and various Sinitic, Kra–Dai, and Austroasiatic linguistic traditions, highlighting the ways in which centuries of interaction shaped the structure, vocabulary, and identity of Vietnamese.