The Portuguese Riviera (Portuguese: Riviera Portuguesa) is the affluent coastal region to the west of Lisbon, Portugal, centered on the coastal municipalities of Cascais (including Estoril) and Sintra. It is coterminous with the Estoril Coast (Costa do Estoril) and occasionally known as the Costa do Sol (Sun Coast). The region is internationally known as a luxury destination for its history as a home of the wealthy, the famous, and European royalty. Both Cascais and Sintra consistently rank among the richest municipalities in Portugal.