The antonymous relationship between fact and fiction is prevalent throughout archaeological theory, with issues of authenticity leading to notions of value and form, from whose authority such decisions are attributed as being of intrinsic concern within the narrative voice. This heuristic praxis is never more apparent than within the resurgent discipline of geomythology. Standing upon over two and half thousand years' worth of related inquiry it still remains a nascent factor in today's scholastic community due to its recent re-branding, predominantly having become catagorized within geoscience and having acquired an orthodoxy to suit. This thesis examines the geomythological path that has led to such an approach, positing a proof of concept methodology that seeks to address the inherent challenges this faces within current theoretical schemata. 

This methodology is then applied to a case study, linking aspects of the Second Branch of Y Mabinogi with Cardigan Bay based upon a deep map of the myth cycle.  It examines three mythical inclusions and considers their scientific viability before postulating how best to express this information in the future via a transdisciplinary form of archaeological representation that could then be applied for tourism purposes either side of the Irish Sea. In turn, this is all then transmediated into a short film called Y Bont, The Bridge.