Mainland Southeast Asia

This part of Asia is a big piece of land.

It sits near the Indian Ocean and the Pacific Ocean. Five countries live here. These are Cambodia, Laos, Myanmar, Thailand, and Vietnam.

Long rivers flow through the land. The Mekong is one big river. Most places are warm and wet. Some parts have high mountains too. It is a very special place to see.

Mainland Southeast Asia is a large part of the continent.

It sits south of China and east of India. To the west is the Indian Ocean. To the east is the Pacific Ocean.

This area includes five countries. These are Cambodia, Laos, Myanmar, Thailand, and Vietnam.

The land has many mountains. These mountains reach up from the Tibetan Plateau. Large rivers flow through the lowlands. The Irrawaddy flows through Myanmar. The Chao Phraya flows through Thailand. The Mekong flows through many places. It goes through Thailand, Laos, Cambodia, and Vietnam.

Most of the region is tropical. This means it is warm and wet. Some parts, like northern Vietnam, are different.

People here have many different cultures. Some cultures were shaped by India. Others were shaped by China. Many people follow Buddhism. Other people follow different faiths. The area is also known for its many languages. These languages have shared many traits over time.

Mainland Southeast Asia is a large part of the Asian continent.

It sits south of mainland China and east of the Indian subcontinent. To the west, you will find the Indian Ocean. To the east lies the Pacific Ocean. This region includes five different countries. These are Cambodia, Laos, Myanmar, Thailand, and Vietnam. It is different from Maritime Southeast Asia, which is made of many islands.

The land here has a very interesting shape. The peninsula reaches southward from the main part of Asia. Many mountain ranges stretch down from the Tibetan Plateau in the north. Between these mountains are lowlands. These lowlands are shaped by three major river systems. The Irrawaddy River flows through Myanmar. The Chao Phraya River flows through Thailand. The Mekong River is very long.

It flows through Northeastern Thailand, Laos, Cambodia, and Vietnam.

People have used many different names for this place. In ancient times, some called it Suvarṇabhūmi. This name means "land of gold" in old texts. In the early 1800s, people began using the name Indochina. A geographer named Conrad Malte-Brun used it in 1804. A linguist named John Leyden used a similar name in 1808. Later, the name described a French colony. Today, most people prefer the name Mainland Southeast Asia.

Nature and weather also change depending on where you go. Most of the region has a tropical climate. This means it is usually warm. However, some places like Northern Vietnam are subtropical.

There is also a special line called the Kangar-Pattani Line. This line sits near the Malaysia-Thailand border. It separates evergreen rain forests from seasonally dry tropical forests. This boundary helps scientists study the different types of plants and animals.

The people living here have many different traditions. Many cultures were shaped by the influence of India. Myanmar, Thailand, Laos, and Cambodia all show this influence. Vietnam was mostly influenced by China. This makes the region very diverse. People follow many religions, but Buddhism is very common. The languages spoken here are also unique. Even though they come from different families, they have shared many traits over a long time.

Mainland Southeast Asia is the continental portion of the Southeast Asian region.

It sits east of the Indian subcontinent and south of mainland China. The region is bounded by the Indian Ocean to the west and the Pacific Ocean to the east. This area includes five sovereign states: Cambodia, Laos, Myanmar, Thailand, and Vietnam. It is distinct from Maritime Southeast Asia, which consists of the various island groups off the coast of the peninsula.

The geography of the Indochinese Peninsula is defined by its unique landforms. The peninsula projects southward from the main Asian continent. Several mountain ranges extend from the Tibetan Plateau in the north. These mountains are interspersed with vast lowlands. These lowlands are primarily drained by three major river systems that flow in a north-south direction. The Irrawaddy River flows through Myanmar. The Chao Phraya River is located in Thailand. The Mekong River is another major system, flowing through Northeastern Thailand, Laos, Cambodia, and Vietnam.

Climate and biology also define the region's boundaries. Most of the area experiences a tropical climate. However, certain areas like Northern Vietnam are subtropical.

Biogeographically, Indochina is part of the Indomalayan realm of tropical Asia. It is bounded on the north by the temperate climates of China and the Tibetan Plateau. To the northwest, it meets the mountainous India-Myanmar border. A significant boundary called the Kangar-Pattani Line bisects the Malay Peninsula near the Malaysia-Thailand border. This line separates the evergreen rain forests of Malesia from the seasonally dry tropical forests of Indochina.

History has provided many names for this territory. Ancient Indian literary sources and Buddhist texts sometimes refer to the area as Suvarṇabhūmi, meaning "land of gold." This name, along with Suvarṇadvīpa, may also refer to insular Southeast Asia. The term "Indochina" emerged in the early nineteenth century. It was likely coined by the Danish-French geographer Conrad Malte-Brun in 1804. The Scottish linguist John Leyden also used the term "Indo-Chinese" in 1808 to describe local inhabitants and languages.

The use of the name "Indochina" has been controversial. Malte-Brun later argued against its use in his Universal Geography. He believed the term overemphasized Chinese influence and suggested "Chin-India" instead. Despite this, the term gained traction and replaced names like "Further India." Later, the name became restricted to the French colony of French Indochina, which included Cambodia, Laos, and Vietnam. Today, scholars and residents more commonly use "Mainland Southeast Asia" to describe the region.

Culture and language in the region reflect deep historical connections. The area has received significant cultural influence from both India and China. Myanmar, Thailand, Laos, and Cambodia show strong Indian cultural influences. In contrast, Vietnam is generally considered part of the Sinosphere, meaning it is part of the Chinese cultural sphere.

Vietnam has also experienced some influence from India. Religion is highly diverse throughout the mainland. Buddhism forms a majority religion in several parts of the region. Other traditions include minor Muslim, Christian, and folk religions.

Linguistically, the region is also unique. The languages of the mainland form what is known as the Mainland Southeast Asia linguistic area. While these languages belong to independent families, they have converged over time. They share many typological similarities, which means they have similar structural characteristics. This contrasts with Maritime Southeast Asia, where the Austronesian languages are spoken. The mainland is instead characterized by Austroasiatic, Tai–Kadai, and Sino-Tibetan languages. These patterns help researchers understand how different groups have interacted across the peninsula over many centuries.