What region is often grouped together with southeast Asia?

Southeast Asia is often grouped together with East Asia, which includes countries such as China, Japan, and South Korea. The region of Southeast Asia is made up of countries located on the southeastern part of the Asian continent and includes countries such as Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar (also known as Burma), the Philippines, Singapore, Thailand, and Vietnam. The region is known for its diverse cultures, tropical climate, and natural beauty. It is also an important economic region, with many of its countries experiencing rapid development and industrialization in recent years.