Competing connectivity strategies are a core component of geopolitics in the twenty-first century -from China's Belt and Road Initiative to Japan's Free and Open Indo-Pacific Strategy. To demonstrate the multifaceted consequences of the new multiplicity of connectivity strategies, we propose a conceptual distinction between two forms of competition among connectivity projects: the commonly addressed horizontal competition between central state-driven connectivity strategies and the less explored vertical competition between existing or potential connectivity schemes below and above the level of the nation state. We contend that although typically targeting differing forms of connectivity, strategies across levels of governance are not necessarily complementary. To the contrary, the geopolitical nature of relatively new and nation-state-driven strategies can also severely undermine sustainable intra-state connectivity. By way of illustration, we examine competing connectivity investments in the Bay of Bengal, a subregion of South Asia between the two Asian rivals India and China. Driven at least partly by horizontal competition, centrally devised and executed connectivity strategies oftentimes crowd out pre-existing connectivity based on subnational initiatives or transnational societal linkages. To fully assess contemporary connectivity investments in Asia, future scholarship should take account of the challenges and complications along both dimensions of competing connectivity strategies.