Most land in Carmarthenshire is classified as Grade 4 land, with a small proportion of Grade 5 land situated towards the northeast of the County.
Caiff y rhan fwyaf o'r tir yn Sir Gaerfyrddin ei ddosbarthu fel tir Gradd 4, gyda chyfran fach o dir Gradd 5 wedi'i leoli tua Gogledd-ddwyrain y Sir.