The Rio-Antirrio Bridge, also known as the Charilaos Trikoupis Bridge, is a cable-stayed bridge that spans the Gulf of Corinth, connecting the town of Rio on the Peloponnese peninsula to Antirrio on the mainland of Greece. The bridge was designed by the French structural engineer Michel Virlogeux and built by a Greek consortium led by the construction company AKTOR SA.

The bridge was completed in 2004 and is considered a modern engineering marvel. It has a total length of 2.9 kilometers (1.8 miles) and a width of 28.2 meters (92 feet). The bridge's central span, which is supported by two 164-meter (538-foot) tall towers, measures 560 meters (1,837 feet) and allows for ships to pass underneath.

The construction of the Rio-Antirrio Bridge was a major undertaking, as the Gulf of Corinth is one of the most seismically active regions in Europe. The bridge was designed to withstand earthquakes up to a magnitude of 7.5 on the Richter scale, as well as high winds and waves.

The bridge has had a significant impact on transportation in Greece, as it has greatly reduced travel times between the Peloponnese peninsula and the mainland. Before the bridge was built, the only way to cross the gulf was by ferry, which was often unreliable and subject to delays.

In addition to its practical benefits, the Rio-Antirrio Bridge has also become a popular tourist attraction, offering stunning views of the Gulf of Corinth and the surrounding mountains. At night, the bridge is illuminated with colorful lights, adding to its aesthetic appeal.