Koulwewa main division is situated on the Narammala-Kulliyapitiya road approximately 5km from Narammala town. Koulwewa farm consists of four divisions. With Land reforms Act the property was vested with the Land Reforms Commission and during 1976 this land was handed over to the National Livestock Development Board. Muwanhela Division was owned by J.L.D. Peiris and later vested with Land Reforms Commission. Polpattala division was privately owned and vested with Land Reforms Commission. During 1976 Land Reforms Commission handed over Polpattala to National Livestock Development Board and Muwanhela was managed by a Co-operate Society was also handed over to the national Livestock Development Board in 1978.

Soils in this region belong to Red Yellow Podzolic soils and their sub groups. These soils are moderately to strongly acidic with a definite trend towards increasing acidity with increasing rainfall. Organic matter and Nitrogen status of the model group is medium and increases with elevation. Phosphorus and Potassium status usually low in the model as well as in the respective sub groups. Soils where the parent rock is rich in Potash Feldspar. The Potassium status is fairly good. Calcium and Magnesium supplies in these soils are quite low but this however, does not seriously affected crop such as rubber. The good cation exchange capacity of these soils enables a satisfactory retention of chemical fertilizers even under high rainfall conditions which are experienced in this soil region. The depth, texture and drainage are extremely good from the point of view of the main plantation crops. Erosion is not a hazard on these soils because of their good structural ability. However, anti-erosion measures are necessary on steeper slopes.