Bhutan is a landlocked kingdom in the Eastern Himalayas, bordered by China and India. The capital is Thimphu. It is known for its rugged mountain terrain and deep valleys. Bhutan is the first and only carbon-negative country in the world, meaning it absorbs more CO2 than it produces, largely due to its law requiring at least 60% of the land to be under forest cover. The country's highest peak, Gangkhar Puensum, is considered the highest unclimbed mountain in the world because the government prohibits mountaineering on peaks higher than 6,000 meters out of respect for local spiritual beliefs. Bhutan is also famous for its 'Gross National Happiness' philosophy.