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Across 4. A high, steep, or overhanging face of a rock. 5. A stream that flows into a larger stream or river or into a lake. 7. Where a river meets a body of water. 8. The highest point of a mountain; top. 10. A low triangular area of alluvial deposits where a river divides before entering a larger body of water. 11. The starting point of a river. 12. An artificial waterway constructed to allow passage of boats or ships inland. 13. A piece of land surrounded by water. 14. A small arm of the sea, a lake, or a river. 15. A large, flat area of land that is higher than the surrounding land.

Down 1. (Physical Geography) a series of adjoining mountains or of lines of mountains of similar origin 2. The expanse of salt water that covers most of the earth's surface and surrounds its landmasses. 3. A body of water partially enclosed by land but with a wide mouth, giving access to the sea. 6. A place on a waterway with facilities for laoding and unloading ships. 9. A piece of land almost surrounded by water or projecting out into a body of water.