Giermo lives in Portugal, so when he is forced out on his journey in the last issue of In Between Days he passes what ancient mariners believed to be the end of the world. Today that area is Cape St. Vincent.
Here are a few scrobblings from Wikipedia and other sources
ape St. Vincent (Portuguese: Cabo de São Vicente, Portuguese pronunciation: [ˈkabu dɨ sɐ̃ũ viˈsẽtɨ]), next to the Sagres Point, on the so-called Costa Vicentina (Vincentine Coast), is a headland in the municipality of Sagres, in the Algarve, southern Portugal.
Cape St. Vincent was already sacred ground in Neolithic times, as standing menhirs in the neighborhood attest. The ancient Greeks called it Ophiussa (Land of Serpents), inhabited by the Oestriminis and dedicated here a temple to Heracles. The Romans called it Promontorium Sacrum (or Holy Promontory). They considered it a magical place where the sunset was much larger than anywhere else. They believed the sun sank here hissing into the ocean, marking the edge of their world.: