Which state has the worlds shortest river?

It depends to some extent on how you define "river" and determine where, precisely, it starts and ends. Oregon and Montana both have claimed to have the shortest river in the world.

In Oregon, their contender is the D River, which is 440 feet long. However, it empties into the ocean, meaning that the length varies depending on the tide, and Oregon claims that at "extreme high tide" the length is only 120 feet.

Montanta's contender is the Roe River, at 201 feet long.

Both are substantially longer than the Reprua river in Abkhazia, leading from Voronya Cave to the Black Sea, a distance of 59 feet.