Rivers
| I | M | W | W | R | H | U | D | S | O | N | W | M | D |
| P | T | N | L | D | L | R | H | Y | H | H | A | Z | Q |
| P | C | T | I | Z | E | B | M | A | Z | G | E | Y | M |
| I | P | H | N | P | Z | D | H | C | D | L | A | D | T |
| S | A | M | A | Z | O | N | A | A | I | N | F | K | G |
| S | R | R | L | N | R | O | L | N | G | K | X | M | A |
| I | I | G | Q | V | G | E | G | T | U | S | N | N | N |
| S | O | N | N | Z | N | J | Z | N | E | B | B | O | G |
| S | G | O | I | A | K | E | I | M | O | T | E | K | E |
| I | R | K | A | D | L | B | A | A | D | C | P | U | S |
| M | A | E | G | X | D | H | T | B | N | R | N | Y | F |
| K | N | M | A | V | T | M | V | D | Z | G | N | K | K |
| K | D | K | R | E | I | Z | N | E | K | C | A | M | Y |
| Q | E | V | A | K | W | K | S | I | R | G | I | T | B |
Amazon Mississippi
Chang Jiang Niagara
Congo Nile
Danube Rio Grande
Ganges Thames
Hudson Tigris
Mackenzie Yangtze
Magdalena Yukon
Mekong Zambezi