| 100% | DAM | 3 | Hoover ___ (river barrier between Nevada and Arizona) |
| 59% | MEAD | 4 | Lake —, reservoir in Arizona and Nevada formed by the Hoover Dam across the Colorado River |
| 58% | MEAD | 4 | Lake —, reservoir in Arizona and Nevada, US, formed by the Hoover Dam across the Colorado River |
| 46% | UTAH | 4 | State between Nevada and Colorado |
| 45% | IDAHO | 5 | State between Nevada and British Columbia |
| 45% | UTAH | 4 | State that's between Nevada and Colorado |
| 42% | PANE | 4 | Barrier between the indoors and the outdoors, often |
| 42% | CALVINCOOLIDGE | 14 | Between Harding and Hoover |
| 41% | UTAH | 4 | State between Idaho and Arizona |
| 40% | FOURTHWALL | 10 | Imagined barrier between actor and audience |
| 40% | DAM | 3 | Hoover ___ (water barrier near Boulder City, Nevada) |
| 40% | STYX | 4 | River between Earth and Hades |
| 40% | IRWELL | 6 | River between Manchester and Salford |
| 39% | RIOBRAVO | 8 | River between the US and Mexico (2 words) |
| 39% | HUDSON | 6 | River located between New York and New Jersey |
| 38% | ZIMBABWEAN | 10 | Dweller between the Zambezi and Limpopo rivers |
| 37% | FDR | 3 | Initials of the president between Hoover and Truman |
| 37% | ERIE | 4 | Great Lake between the Detroit and Niagara rivers |
| 37% | IOWA | 4 | State between Missouri and Mississippi River |
| 37% | IOWA | 4 | State between Missouri and Mississippi rivers |
| 37% | FDR | 3 | Initials of the US president between Hoover and Truman |
| 37% | DEAN | 4 | Forest of —, region between the Rivers Severn and Wye |
| 37% | IOWA | 4 | It's sandwiched between the Mississippi and Missouri rivers |
| 36% | AMUR | 4 | Border river between China and Russia |
| 36% | AMURRIVER | 9 | Major river between Russia and Manchuria |
| 35% | DAM | 3 | Nevada/Arizona's Hoover |
| 35% | DAM | 3 | Nevada/Arizona's Hoover ___ |
| 35% | ETRURIA | 7 | Ancient region of central Italy between the Rivers Tiber and Arno |
| 35% | RHYMNEY | 7 | River in Wales forming the boundary between the historic counties of Glamorgan and Monmouthshire |
| 35% | YALU | 4 | River that forms a large part of the border between North Korea and China |