This site is 130km northwest of Hanoi in a straight line.
| Latitude | 21° 24´ |
| Longitude | 104°47´ |
| Altitude | 100-400 m.s.l. (mean sea level) |
| Area size | 5ha |
| Topography | Small hill with a gentle slope |
| Soil type | Lateritic |
| Drainage | Fairly good |
| Original site condition | Secondary natural forest after logging |
| Climate | Tropical dry, monsoon type |
| Rain | Summer rainfall from April to November Annual precipitation 1200 to 2200mm |
| Temperature | Average temperature between 22°and 23°C |
The Tran Yen plantation in northern Vietnam is in the Monsoon Climatic Zone, where the annual precipitation all falls during the rainy season (April to November).
Yen Bai site
Saplings of the five native species, produced by TGG technology, are being transplanted at this site by members of the FSIV. Planting is carried out during the early rainy season to prevent desiccation of the saplings.