Indochina (also spelled Indo-China) lies between two of the world's oldest civilizations, India and China.
The Geography of Southeast Asia
The region contains many fertile plains formed by three major rivers -- the Mekong, Salween, and Irrawaddy. The land is rich in mineral resources, including petroleum, tin, tungsten, lead, zinc and iron, among others.
Today, Southeast Asia includes the countries of Cambodia, Laos, Vietnam, and sometimes is said to include Myanmar (also known as Burma), Thailand, Malaya (part of Malaysia), and Singapore.
Here are a few links for finding more information about the geography of the region:
The History of Indochina
The name Indochina comes from the French imperial presence between 1884 and 1954 in Southeast Asia. France withdrew from southeast Asia in 1954 following the loss of the Indochina War.
Here's a brief video showing images of mostly rural places. Rivers and boats play a vital role in the region.