Cuatro fronteras europeas bajo la lupa. Una metodología para el análisis R. Pastor Saberi; M. Castañer i Vivas de los proyectos de cooperación transfronteriza (INTERREG)
Lastly, natural frontiers are frontiers that states have established along physical barriers, adding to the impression of separation and distancing -both real and symbolic. Examples of such barriers are mountains or rivers (13) . To get across these natural elements requires technical solutions, which can both be costly and call for complicated agreements stemming from delicate negotiations, such as building bridges or tunnels. A natural frontier is an obstacle that can hinder cooperation, but in some cases it can also give rise to a partnership between states that want to strengthen relations with one another and implement joint projects.
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