Travel from Central Asia to Southeast Asia or vice versa, you may use the following border crossings through China, you may follow the ancient Silk Road. 

Central Asia - The five 'stans: Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan. Tucked between India, Russia and China, the five 'stans are a congregation of mountains, steppe grassland and desert.

The following border crossing to China are commonly used by overland travelers.