The training and experimental forest range is located in the pass between Rila and the Western Rhodopes mountains in the forest land of Yundola, 15 km from the town of Velingrad. The training and experimental forest in Yundola is located at between 1000-1800 m altitude. The forest has been a state property since the ancient times. The total area of the forest fund in the region of the training and experimental forest range amounts to 5190,6 ha, 4853,8 ha – afforested area. The forest stands contain the following tree species: Scots Pine - 1935,3 hа (or 40% of the forest fund); Norway Spruce - 1427,7 ha (30%); Silver Fir - 1267,8 ha (26%); Beech - 166 ha (3%), etc.
The total stock amounts to 1324500 cubic metres or average stock - 273 cubic metres per ha (logs only). The average annual increment of the total area is 17 200 cubic metres. The average age of the stands is 75 years. The stands are exclusively coniferous, consisting mainly of Scots Pine, Norway Spruce and Silver Fir. The percentage of the broadleaved species is insignificant, mainly Beech and Sessile Oak. The growth conditions are typical of coniferous stands and allow the establishment of various training and demonstration sites and experimental areas. The lowest point of the area is the valley line of Dulboki Dol and Lyuta Reka (1030 m altitude), and the highest point is Arapchal Peak (1834 m). The average altitude of the wood productive forest area is 1460 m. The head office of the forest range is situated at an altitude of 1380 m. The average annual afforestation in the range amounts to 100 da. The total area of the tree nursery amounts to 19 da producing 500000 seedlings of Norway Spruce, Scots Pine and Silver Fir. From the scientific point of view, numerous scientific short-term and long-term experiments have been carried out and permanent experimental plots have been established. As a result of these experiments a number of issues regarding the growth and productivity of the main forest tree species, stand structure, proper fellings, forest and site types, form (ecological and biotype) diversity of species, have been clarified. Experiments related to many of these issues are still being carried out. At present, scientific observations are being made on permanent experimental plots by the departments of Forest Management, Silviculture, Dendrology, etc. Interesting studies are being conducted on the established geographic cultures with the purpose of checking the growth and productivity of coniferous species of different origins. A special experimental plot has been designed in the watershed area of Bazenishki Dol where a precipitation measuring stations have been built for measuring the water flow under different natural and working conditions. A monitoring station, under a Bulgarian-Swiss Project No.2 has also been built in the area of the forest. G. St. Avramov Training and Experimental Forest Range, run by the University of Forestry, has been established as a centre for practical training and scientific research of both students and teaching staff.