What river was especially cursed by God in Section 61 of the Doctrine and Covenants?

TRIV What river was especially cursed by God in Section 61 of the Doctrine and Covenants?

These things are written that we may rid our garments of the blood of our brethren, who have dwindled in unbelief. Mormon 9:35 Mormon 9:35

For I, the Lord, have decreed in mine anger many destructions upon the waters; yea, and especially upon these waters. Doctrine & Covenants 61:5

I, the Lord, have decreed, and the destroyer rideth upon the face thereof, and I revoke not the decree. Doctrine & Covenants 61:19

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