Answer :
Answer: Amu Darya.It borders Afghanistan and Tajikistan and in part between Uzbekistan and Turkmenistan.
Explanation:
Amu Darya basin
The Amu Darya is the longest river in Central Asia and the second longest in Afghanistan. Six countries share the river Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan
The Amu Darya is the longest river in Central Asia and the second longest in Afghanistan. Six countries share the river Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan