(1) “Farm land.” Any tract or tracts of land in common ownership of at least twenty acres in area, used for the raising of livestock or the growing of crops.

(2) “Forest land.” Any tract or tracts of land in common ownership of at least twenty-five acres in area used for the growing of timber crops.

(3) “Water supply land.” Any land used for the protection of watersheds and water supplies, including but not limited to land used for the prevention of floods and soil erosion, for the protection of water quality, and for replenishing surface and ground water supplies.

(4) “Open space land.” Any land, including farm, forest and water supply land, in common ownership, of at least ten acres in area, in which site coverage by structures, roads and paved areas does not exceed three percent. Open space land includes land the restriction on the use of which could (i) conserve natural or scenic resources, including but not limited to soils, beaches, streams, wetlands, or tidal marshes; (ii) enhance the value to the public of abutting or neighboring parks, forests, wildlife preserves, nature reservations, or other public open spaces; (iii) augment public recreation opportunities; (iv) preserve sites of historic, geologic, or botanic interest; (v) promote orderly urban or suburban development; or (vi) otherwise preserves open space without structures, roads and paved areas exceeding three percent of site coverage.

(5) “Municipality.” Any city, borough, town or township.