Charneca de Caparica sits on the high, sandy plateau behind the beaches of the Costa da Caparica, on the south side of the Tagus across from Lisbon. It is part of Almada and mostly residential, a sprawl of villas, small streets and umbrella pines spread over land that was once heath and scrub, which is what charneca means. To the west the plateau ends abruptly at a line of tall, golden cliffs, and below them lies one of the longest unbroken beaches near any European capital.
Those cliffs are the Arriba Fóssil da Costa da Caparica, a protected landscape of ancient sea cliffs stranded inland when the shoreline moved out. They are made of layered sands and clays packed with fossil shells, and the colours change through the day from cream to ochre to deep rust at sunset. Pine woods planted centuries ago to hold the sand still cover much of the top, including the Mata dos Medos, a forest once tended to stop dunes burying the farmland, and the smell of warm resin on a summer afternoon is part of the place.
For a finish, the riding is short and suburban. You arrive on busy roads through roundabouts and housing, and on summer weekends the routes down to the beaches jam with Lisbon traffic heading for the sea. Cobbles and patched tarmac appear in the older streets, and sand blows onto the roads near the coast, so take the last corners gently. The views improve the closer you get to the cliff edge, where small roads drop down to the beach, and a clear evening shows Cabo Espichel to the south and the hills of Sintra across the water.
Everything you need is close. Charneca itself has fuel, supermarkets and cafes, and Costa da Caparica, a few kilometres away, is the beach town proper, with a long promenade and seafood restaurants that grill sardines and fish outside on charcoal. If you have energy left, the beach bars strung along the sand south of the town are where Lisbon goes to watch the sun go down into the Atlantic.
Across the river the city is close but feels far. The 25 de Abril bridge, with its red towers, and the Cristo Rei statue on the Almada side are visible from many corners of this side of the river, a reminder that you are only half an hour from the capital, traffic allowing.