You roll out from Évora’s convent quarter, slipping past layers of Roman, medieval and baroque walls before the buildings thin and the horizon opens. The first leg across the plains is about rhythm and distance: long views, scattered cork oaks and vineyards, gentle undulations that let the bike find a natural pace. Reguengos de Monsaraz appears as the first hub of the day, a wine town where the morning stop at Gosttii sits among the estates and cooperative wineries that define the local economy.

From here the ride gains height as it approaches Monsaraz. The village suddenly appears on its ridge, walls and keep silhouetted above the reservoir basin. The approach roads tighten slightly and then the pace drops as you pass through the gate onto cobbles and narrow lanes. Inside, the layout still speaks of a frontier stronghold: houses packed along the crest, church and castle commanding the ridge, and beyond the parapets the huge surface of Lake Alqueva filling much of the old Guadiana valley.

Dropping back off the ridge, the line joins the modern alignment towards the lake and immediately commits to the long viaduct of Ponte de Xerez de Baixo. The span feels engineered for big skies: the deck stretches over open water and semi-submerged islands, and you get an uninterrupted sense of how the dam has reshaped the river. The short spur down to Praia Fluvial de Mourão then brings you back to water level, with sand, pontoons and a low, wide horizon emphasising the scale of the reservoir from shore height rather than bridge height.

South of Mourão, Ponte de Alcarrache tells a subtler part of the same story. Here the road is carried over a drowned tributary valley, with narrower inlets and more enclosed views, and the viaduct feels like a deliberate stitching-together of landscape that was cut by the rising water. Once clear of the reservoir margins the route settles onto a rural plateau and swings towards Moura, where low hills and small farms give way to the symmetry of the main square. Central Café on Praça Sacadura Cabral is pitched exactly where you need it: informal, quick to use, and rooted in a square that sits directly below the castle garden.

The next leg through the olive belt is visually repetitive in a good way. Grid-planted groves and irrigation systems run away from the roadside, illustrating how traditional olive culture has been mechanised to produce Azeite de Moura oils for export. Approaching Serpa, the town’s defensive role becomes obvious as towers and walls begin to dominate the skyline. Instead of just skirting on the ring road, the route pauses so you can see the 17th-century aqueduct arches meeting the medieval wall, a precise bit of stonework where water supply and fortification are literally joined.

Beyond Serpa the feel changes again as you enter Vale do Guadiana Natural Park. The road crosses low schist ridges and shallow saddles, dipping into side valleys and climbing out over montado pasture and fields. There is a sense of space, but the landscape is more varied than the morning’s wide plains, and the approach to Mértola sharpens this further as the Guadiana gorge closes in. The town itself piles up on the rock above the river, with the castle and former mosque–church highlighting the Islamic and medieval layers that underpin its “museum town” concept.

Café Guadiana on Largo Vasco da Gama works well as an afternoon anchor: it sits at the hinge point between riverfront and upper town, so you can see bridge, water and the lower quarters while still being close to the climb up to the castle streets. When you finally point the bike away from Mértola, the emphasis shifts decisively from exploration to connection. A broad main road leads north towards Beja, letting you cover the remaining distance smoothly before turning into the town centre and finishing inside the thick walls of Pousada de São Francisco. Ending the day in a 13th-century convent converted to a pousada mirrors the historic start in Évora and closes the loop of castles, churches, bridges and reservoirs in a satisfying way.

This day is suitable for most riders who are comfortable with a full, varied schedule. Urban sections in Évora, Monsaraz, Moura, Serpa, Mértola and Beja involve cobbles, tight junctions and occasional pedestrians; low speed and patience are key. The reservoir bridges at Xerez de Baixo and Alcarrache are exposed to crosswinds, especially on gusty days. In high summer, heat across the Alentejo can be intense, so frequent hydration and sun protection matter. Wildlife is mostly limited to birds, but you may encounter stray dogs near villages and slow-moving agricultural machinery on the olive corridors; both can appear unexpectedly.