| 100% | RIVERBED | 8 | Channel where a river flows, or has flowed |
| 52% | FORK | 4 | Where a river or road branches into two |
| 50% | SOURCE | 6 | Where a spring or river begins |
| 49% | ESTUARY | 7 | The area where a river meets the sea or ocean |
| 45% | TRIBUTARY | 9 | River or stream that flows into a larger river |
| 42% | ESTUARY | 7 | Where a river meets the sea |
| 42% | DELTA | 5 | Where a river meets the sea |
| 41% | RIVERBED | 8 | Where a "flower" flows |
| 41% | TRIBUTARY | 9 | A river flowing into a larger river |
| 41% | ESTUARY | 7 | Where a river connects to the sea |
| 40% | EMBASSY | 7 | Where a foreign diplomat may have an office |
| 40% | SNY | 3 | ___e: side channel of a river |
| 40% | PITSTOP | 7 | Where a Formula 1 car has a wheel change |
| 40% | OVEN | 4 | Where a cookie sheet or muffin pan is used |
| 40% | INTHEHOLE | 9 | Having debts ... or where to find a golf ball after 17-, 30-, 37- and 48-Across's starts? |
| 39% | FERTILESOIL | 11 | Feature of a river delta or floodplain |
| 39% | MONTANA | 7 | Where the Tongue River flows |
| 39% | NORTHCAROLINA | 13 | Where the Tar River flows |
| 39% | AFGHANIS | 8 | Where the Helmand River flows |
| 39% | IOWA | 4 | Where the Skunk River flows |
| 39% | HADES | 5 | Where the river Styx flows |
| 39% | GHANA | 5 | Where the Volta River flows |
| 39% | ARAGON | 6 | Where the Ebro River flows |
| 39% | INTHEFIELD | 10 | Where a specialist has expertise |
| 39% | PO | 2 | A river or a Teletubby |
| 39% | WEIR | 4 | A low dam in a river that regulates its flow |
| 39% | WATERFALL | 9 | Formation where a river spills over a cliff |
| 39% | ANGRY | 5 | Having a cow or having kittens |
| 39% | TRIBUTARY | 9 | River flowing into a larger one |
| 39% | BOARDROOM | 9 | Where a business has professional meetings |