This presentation examines how border security practices, media technologies, and geological environments generate reverberations at the Russian-Lithuanian border on the Curonian Spit, a peninsula along the southeastern Baltic Sea coastline. The talk introduces a research-creation project titled Radiant Center, which investigates two interrelated phenomena: the operationalization of the electromagnetic spectrum in border maintenance and the geological agency of an aeolian sandscape that proves recalcitrant to national security objectives. By employing embodied listening methodologies, this work reveals how border technologies become embedded in—and contested by—physical landscapes. The project combines field recordings of two-way radio communications, electromagnetic emissions, and subterranean vibrations with interviews and archival materials to create sonic compositions that amplify media-environment entanglements. Through attention to both on-site surveillance systems and remote border management technologies, Radiant Center demonstrates how media infrastructures and environmental conditions collaborate and collide in ways that destabilize national borders. Revealing how geological formations actively participate in the negotiation of political boundaries, this talk contributes to broader debates about the role of nonhuman actors in technological systems of control.