carr

noun3

1. •
   Any marsh; marshy ground, swampland.

   • The marsh lands or ‘carrs’ that covered the low-lying floor of the vale could not be cultivated and the poorly drained flanks of the vale would be best used as pasture. — 2007
2. •
   In particular, a marsh or fen formed when the litter of decaying reeds (e.g. in a lake) raises the ground level above the water, allowing more vegetation like sedges and then low bushes or trees to grow; a marshy woodland. (Compare marsh, swamp, bog, fen.)
3. •
   Rock.