Southeast Asia is a group of countries that lie south of China, east of India, north of Australia, and west of Papua New Guinea. This area of the world stretches roughly 4,000 miles and is made up of mountainous regions, river deltas, and ocean shorelines. Home to a number of religions, cultural groups, languages, and topography, it is a part of the world that will memorize you and make you feel like you never want to leave.