It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; Bhutan, the People's Republic of China and Nepal to the northeast; an
d Bangladesh and Burma to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; in addition, India's Andaman and Nicobar Islands share a maritime border with Thailand and Indonesia. The Indian economy is the world's tenth largest economy by nominal GDP and fourth largest economy by purchasing power parity. Following market-based economic reforms in 1991, India has become one of the fastest growing major economies, and is considered a newly industrialized country; however, it continues to face the challenges of poverty, illiteracy, corruption and inadequate public health. A nuclear weapons state and a regional power, it has the third-largest standing army in the world and ranks tenth in military expenditure among nations.