WordNet (r) 3.0 (2006):

Riviera
    n 1: a coastal area between La Spezia in Italy and Cannes in
         France; "the Riviera contains some of Europe's most popular
         resorts"

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "riviera":
   bank, beach, berm, coast, coastland, coastline, embankment,
   foreshore, ironbound coast, lido, littoral, plage, playa,
   riverside, rockbound coast, sands, sea margin, seabank, seabeach,
   seaboard, seacliff, seacoast, seashore, seaside, shingle, shore,
   shoreline, strand, submerged coast, tidewater, waterfront,
   waterside