Located in the eastern Bhutan within the boundaries of four districts but primarily in Mongar is an ecological thriving land called Phrumsengla National Park formerly known as Thrumshingla National Park. The newest national park of Bhutan, Thrumshingla has gained its status as national park in July 1998. Endowed with rich flora and fauna, Thrumshingla National Park, is also a temperate park with large tract of old-growth forest which has ensnared the heart of many travelers. Thrumshingla National Park is connected with biological corridors from Bumdeling Wildlife Sanctuary, Wangchuck Centennial Park, Jigme Singye Wangchuck National Park and Royal Manas National Park.
With the altitude ranging from 700mt to 4400mt Thrumshingla National Park is blessed with the diverse wildlife of both alpine and subtropical region. The moist ambiance of the sub tropical part of Thrumshingla Park creates the ideal breeding ground to house a vast collection of avifauna. 341 species of birds are recorded in the national park including the endangered Rufous-necked hornbill, beautiful nuthatch, ward's trogon, white-naped Yuhina and brown wood owl which has made Thrumshingla birding paradise for avid bird watchers. Birdlife International has recognized Thrumshingla National Park as an important Bird Area in the Sino-Himalayan mountain forests. Birds are not the only species which are sighted in the national Park Himalayan black bear, snow leopard, red-panda and Royal Bengal tiger along with musk deer and langurs stays peacefully in the diverse ecosystem. Adding to the pristine environment are the rocky cliffs and misty rainfalls which are a guaranteed breath catching sight. The Lateral Road, which cuts across the park, is a popular motor able road. Tourists who are venturing upon the less trodden land of Thrumshingla National Park will find many astounding trekking routes which offers the most awe-inspiring view of the lofty mountains and subtropical forest region whereas some of the routes are yet not traveled upon. Rhodungla and Bribdungla are some of the high mountain breathtaking trek and some of the lower elevation treks are Kheng Shingkhar and Latongla Trek. The eerie ambiance of national park with occasional hooting and shrieking of exotic birds makes the whole expedition more adventurous. The verdant land of Thrumshingla also called treasure house of medicinal plants or the paradise for the botany enthusiast where till date 152 medicinal plants are recorded.
Far from the rambling city noise into the nurturing lap of Mother Nature where the sight the luxuriant forest and alluring chirping of birds lets you rejuvenate your tired soul, the solitude which ones crave in the monotonous urban life can be found in the dense subtropical and alpine forest of Thrumshingla National Park. Trek through the dense forest while spotting exotic birds and untamed animal while inflating your lungs with the untainted air during your visit in Thrumshingla National Park.
Autumn season from October to November, when the weather is pleasant and trekking route dry and late spring season from April to June, when rhododendron covers the entrance of the national park with soft hue of red are considered the best times to visit Thrumshingla National Park. It is best to avoid the national park if tourists are not up for a strenuous trek since the trail become slippery and also to escape the blood sucking parasite like mosquitoes and leeches.