The Boundary Commission of 1924–1925 represents the only statutory attempt to adjust the new Irish border in a more equitable and rational way so as to reflect the wishes of the inhabitants on both sides. This chapter looks at the workings of the commission, some of the fundamental flaws in its terms of reference and the insoluble problems it encountered in trying to create a workable frontier that met the political aspirations of both governments and their respective minority populations. The shambolic failure of the commission is explored and its effects on the political culture of the sizeable northern Catholic minority that remained.