Rossport is a small, sparsely populated rural area in the West of Ireland. Over the past seven years, some of its residents have been engaged in a struggle against the building of a gas pipeline through their locality by multinational corporations, including Shell and Statoil. Their struggle has garnered opposition and support within Ireland and internationally. This paper takes the story of Rossport as the starting point for a broader discussion of epistemology within political geography. Drawing on the work of Walter Mignolo, in particular his ideas about ‘border thinking’ and the ‘decoloniality of knowledge’, it argues that Rossport offers the possibility for a redeployment of postcolonial thought within political geography.