Thunder on the Ohio was a hydroplane boat race in the H1 Unlimited season. Thunder was held each year on the Ohio River in downtown Evansville, Indiana, United States. Evansville had hosted Thunder on the Ohio consecutively since 1979 (although the race had been founded in 1938). The winner of Thunder on the Ohio received the Four Freedoms Cup, which was named after the nearby Four Freedoms Monument which rests along the Ohio River. The race had frequently been broadcast on major television networks such as ESPN and SPEED. Historically, most of the world speed records for two-mile courses have been set on Evansville’s sporty tri-oval.