The Collaborative International Dictionary of English v.0.48:

Plage \Plage\ (pl[=a]l), n. [F., fr. L. plaga.]
   A region; country. [Obs.] "The plages of the north."
   --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

plage
    n 1: the beach at a seaside resort

Moby Thesaurus II by Grady Ward, 1.0:

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