Samiguel d'Ucio is one of nine parishes (administrative divisions) in Ribadesella, a municipality within the province and autonomous community of Asturias, in northern Spain.
It is 5.06 km2 (1.95 sq mi) in size, with a population of 367 (INE 2006).
43°27′N5°05′W / 43.45°N 5.09°W / 43.45; -5.09
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