Wordnet 3.0
NOUN (1)
1. 
 low level country; 
ADJECTIVE (1)
1. 
 of relatively low or level country; 
The Collaborative International Dictionary of English v.0.48:
Lowland \Low"land\, n.
   Land which is low with respect to the neighboring country; a
   low or level country; -- opposed to highland.
   [1913 Webster]
   The Lowlands, Belgium and Holland; the Netherlands; also,
      the southern part of Scotland.
      [1913 Webster]
WordNet (r) 3.0 (2006):
lowland
    adj 1: of relatively low or level country [ant: highland(a),
           upland]
    n 1: low level country [ant: highland, upland]