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Peat soils are soils that contain large amounts of organic matter. Utilization of peatlands as plantations has been carried out in West Kalimantan. One of the plants that is cultivated is Longan. Indicators that need to be known to determine the suitability of peatlands as plantations are specific gravity. Specific gravity is the ratio between the dry weight of the soil and the volume of the soil excluding the pores found between the particles. This study aims to determine the specific gravity characteristics of the longan peat estates in West Kalimantan. Measurement of specific gravity is done using ASTM D-854-02 - Pycnometer. The results obtained a specific gravity of 0.28 gcm-3 at depths of 03-350 cm and 0.38 gcm-3 at depths of 350-550 cm. The measurement results show that the specific gravity is getting bigger along with the increase in soil depth due to the reduced water content. Based on the results of research on peatlands in West Kalimantan suitable to be used as a Kelengkeng plantation land.