The Le?na Woda nature reserve was established by a regulation of the Minister of Forestry and Timber Industry of 4 February 1958 (MP No. 11). It is situated approx. 1 km north of Le?na Woda on the border with the Lower Silesia province, on the western edge of the wood, next to the Bystrzyca-Wójcice forest road, in sections 27 and 59. It covers an area of 20.94 ha. In the reserve one can encounter the Galio odorati-Fagenion and Tilio cordatae-Carpinetum betuli. The legally protected tree stand includes natural monuments and old imposing beeches. Protected plant species occurring in the reserve include the sweet woodruff, lily-of-the-valley, common ivy, martagon lily and glossy buckthorn. The Le?na Woda reserve was established to protect a natural mature mixed forest with a large community of the European larch. The trees are up to 160 years old.