This chapter examines how post-1947 vernacular periodicals in Assam moulded discourses on language, territory, and identity in India’s multilingual north-eastern frontier. Through an analysis of literature published in these periodicals (1960s–1980s), it explores how they employed symbolic representations of language, the human body, and Assam’s riverine geography to foster unity among language groups and manage the complexities of a multilingual society. It shows how these periodicals scrutinised and emphasised linguistic and cartographic boundaries as tools for governing multilingual realities, aiming to naturalise Assamese linguistic authority in the state, create a demographic majority counterbalancing the Bengali-speaking Cachar region, assimilate minor ethnolinguistic groups, and neutralise potential demands for language-based political autonomy. The chapter reveals an inherent paradox: while the periodicals promoted linguistic homogenisation, they also inadvertently documented multilingualism, mobility, and borderland fluidity that defied rigid territorial and linguistic categorisation. Situating these debates within broader postcolonial processes of nation-building reveals how vernacular periodicals reflect contradictions between efforts to fix linguistic and geographic boundaries and lived realities of hybridity and transborder connections. The study highlights the value of interdisciplinary approaches to analyse linguistic politics within national borders, emphasising relationships between dominant narratives of exclusion and contested experiences of linguistic diversity and spatial negotiation.