Portugal's most Islamic town — a Roman fort, Moorish mosque-church, and the Guadiana at its feet
Mértola is a small whitewashed hill town in the Alentejo where the rivers Guadiana and Oeiras meet — a place so steeped in Moorish heritage that its parish church is a former mosque, one of very few in Portugal still showing its Islamic origins from the outside. The town sits on a Roman castrum above a dramatic river confluence; its archaeological museum holds one of the finest collections of Islamic art in Portugal. The surrounding Castro Verde plains are a Important Bird Area for great bustards and black storks; the Dark Sky park designation covers the entire region.
Mértola (Roman Myrtilis) was a significant port city during Roman rule, when the Guadiana River was navigable this far inland and the town exported minerals from the surrounding mines. Under Moorish rule (711–1238 CE) it was the capital of a taifa kingdom and a centre of Islamic scholarship — the mosque built in the 10th century was converted to a church after the Portuguese reconquest but its prayer niche (mihrab), horseshoe arches, and original columns survive intact, making it one of the best examples of Iberian Islamic religious architecture. After the Christian reconquest the town's impo…