At the foot of the Himalayas, Chitwan is one of the few remaining undisturbed vestiges of the Terai region, which formerly extended over the foothills of Nepal. It has a particularly rich flora and fauna. One of the last populations of single-horned Asiatic rhinoceros lives in the park, which is also one of the last refuges of the Bengal tiger. There are also elephants that reside in the Chitwan national park as does this particular strain of Psilocybe cubensis.