Wikipedia
Barranquenho (Barranquenhu; English: Barranquian), is a Romance linguistic variety spoken in the Portuguese town of Barrancos, near the Spanish border. It can be considered a variety of Portuguese (Alentejan Portuguese) heavily influenced by the dialects of neighbouring areas in Spain in Extremadura and Andalusia (especially those from Encinasola and Rosal de la Frontera), or a Spanish dialect (Extremaduran / Andalusian) heavily influenced by Portuguese.
Barranquian is intelligible to speakers of either Standard Portuguese or Standard Spanish. Barranquian speakers say that they speak neither Spanish nor Portuguese but a third language. Ethnologue lists Barranquian as a dialect of Extremaduran, perhaps because Barrancos was populated by settlers from Badajoz, in Extremaduran territory.
The development of Barranquenho seems to be relatively recent (in the past 200 years) unlike other minority linguistic varieties in the Iberian Peninsula, which have medieval roots.