Gelli Aur is a 123 Hectare (305 acres) mainly grassland farm situated in the Towy valley, 3 miles from Llandeilo and 14 miles from Carmarthen. The farm buildings are situated at the northern end of the farm where the land lies at an altitude of 30ft above sea level. The soil can be classified as alluvial and the annual rainfall is high, averaging 70 inches per year.
Coleg Sir Gar owns Gelli Aur and manages the neighbouring farm (Pentrecwn) on a 5 year Farm Business Tenancy. Pentrecwn Farm is a 101 Hectare (250 acre) grassland farm (including dairy buildings) with the land and buildings being utilised by the Spring Calving herd.
The objectives for Gelli Aur College Farm are as follows: