The Collaborative International Dictionary of English v.0.48:

Table-land \Ta"ble-land`\, n.
   A broad, level, elevated area of land; a plateau.
   [1913 Webster]

         The toppling crags of Duty scaled,
         Are close upon the shining table-lands
         To which our God himself is moon and sun. --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tableland
    n 1: a relatively flat highland [syn: tableland, plateau]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "tableland":
   alkali flat, alluvial plain, basin, bench, bottomland, bushveld,
   campo, champaign, champaign country, coastal plain, delta, desert,
   down, downs, fell, flat, flat country, flatland, flats, grass veld,
   grassland, heath, lande, level, llano, lowland, lowlands,
   lunar mare, mare, mesa, mesilla, moor, moorland, open country,
   pampa, pampas, peneplain, plain, plains, plateau, playa, prairie,
   salt flat, salt marsh, salt pan, savanna, sebkha, steppe, table,
   table mountain, tree veld, tundra, upland, vega, veld, weald,
   wide-open spaces, wold