Which river of Eden wound through the land of Havilah, where there is gold?

Answer: Pishon

The first of Eden's four rivers, the Pishon, wound through Havilah, whose gold is pure; the Gihon flowed through Cush.

“The name of the first river is the Pishon; it winds through the whole land of Havilah, where there is gold. And the gold of that land is pure, and bdellium and onyx are found there.”— Genesis 2:11-12 (BSB)