The port of Rianxo is one of the key locations in a town closely linked to the sea and its industry. It is predominantly a mussel-producing port, but also has a diverse activity with various seafood products such as clams, cockles, and scallops.

The petroglyphs of Os Mouchos, in the village of Brión, parish of Leiro (on the path leading to As Cunchas beach), are one of the most interesting and easiest to find groups of rock art in Rianxo.

Robustiano Losada is an artist from Rianxo, known as "Nuco." This versatile creator has a museum in his own home, open to visitors free of charge.

The Rianxo Sea Museum, located in the Casa do Coxo, is a space dedicated to the history and maritime culture of Rianxo. Through its exhibitions, the museum showcases Rianxo's close relationship with the sea.

The cross of the three crosses of Rianxo, located in Puntal da Braña, is an outstanding religious and cultural monument that is a must-see for tourists.

The Moon Castle is one of the most iconic and outstanding historical remains of Rianxo. Located next to the coastline, in the middle of the Arousa estuary, today only the remains of what was once an important fort for surveillance and defence survive.

The Manuel Antonio´s House is a cultural space dedicated to the life and work of the modernist poet Manuel Antonio, one of the most prominent figures in 20th-century Galician literature.

Temple of great historical and religious value. With a simple and traditional style, it is a place of pilgrimage and devotion, especially during the festivities in honour of the Virgin.

The Church of San Ramón de Bealo is a prominent example of religious architecture in Boiro. Built in the 18th century, near important archaeological remains, it combines different artistic elements from the Baroque and Neoclassical periods, with its main façade and bell tower being particularly noteworthy.