| 100% | DOURO | 5 | River on the border between Spain and Portugal before flowing west to the Atlantic |
| 89% | DOURO | 5 | River that forms part of the border between Spain and Portugal before flowing west to the Atlantic |
| 61% | GUADIANA | 8 | River on the border between Spain and Portugal |
| 50% | DOURO | 5 | River that forms part of the border between Spain and Portugal |
| 41% | ELBE | 4 | River that formed part of the border between East and West Germany |
| 40% | ARCH | 4 | Type of structure dedicated to peace and built on the border between Blaine and Surrey |
| 40% | TAGUS | 5 | River that flows to the Atlantic at Lisbon, Portugal |
| 37% | LIMPOPO | 7 | River forming the border between Zimbabwe and South Africa |
| 36% | VICTORIAFALLS | 13 | Landmark on the border between Zambia and Zimbabwe |
| 36% | MATTERHORN | 10 | Mountain on the border between Italy and Switzerland |
| 36% | TITICACA | 8 | Andean lake on the border between Peru and Bolivia |
| 36% | DEAD | 4 | Lake on the border between Israel and Jordan, ___ Sea |
| 36% | TAHOE | 5 | Resort lake on the border between California and Nevada |
| 36% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 35% | MORAVA | 6 | River that forms the border between Slovakia and Austria |
| 35% | MEKONG | 6 | River that forms the border between Laos and Myanmar |
| 35% | DEMERARA | 8 | River in Guyana flowing north to the Atlantic at Georgetown |
| 35% | ARAS | 4 | River forming part of the border between Azerbaijan and Iran |
| 35% | MOSELLE | 7 | River forming part of the border between Germany and Luxembourg |
| 35% | SUWANNEE | 8 | US river rising in the Okefenokee Swamp on the Georgia-Florida border that flows to the Gulf of Mexico |
| 35% | SUWANNEE | 8 | US river rising in the Okefenokee Swamp on the Georgia-Florida border which flows to the Gulf of Mexico |
| 35% | ODER | 4 | River that forms part of the border between Germany and Poland |
| 35% | TAMAR | 5 | River that forms most of the border between Cornwall and Devon |
| 35% | ORINOCO | 7 | River that forms part of the border between Colombia and Venezuela |
| 35% | MOSELLE | 7 | River that forms part of the border between Germany and Luxembourg |
| 35% | LIMPOPO | 7 | River that serves as the border between Zimbabwe and South Africa |
| 35% | RIONEGRO | 8 | River that forms part of the border between Colombia and Venezuela |
| 34% | SNAKE | 5 | — River, US watercourse forming part of the border between Idaho and Oregon |
| 34% | ELIAS | 5 | Mount Saint ___ (peak on the border between the Yukon and Alaska) |
| 34% | DETROIT | 7 | Largest city on the border between the U.S. and Canada |