“On which river is the Diamer-Bhasha Dam being built?”

"On which river is the Diamer-Bhasha Dam being built?"
Answer: "Indus"

"The Diamer-Bhasha Dam is under construction on the Indus River in Pakistan. 'Being built' is the present continuous tense indicating ongoing construction. Alternatives include 'being constructed' or simply 'on which river is the dam