A gated passageway used to raise and lower ships in a system of connected canals.

A small river that flows into another river.

A raised riverbank built to control flooding and reduce damage to homes and crops.

An imaginary line through the Rocky Mountains that separate rivers flowing west from rivers flowing east.

A flat lowland next to a coast.

An area where waterfalls flow from higher to lower ground.

A liquid fuel made in part from plants.

A region of parallel mountain chain.

A park that was set aside for the public to enjoy its great natural beauty.

The elevation above which it is too cold for trees to grow.

A dry wind that sometimes blows in winter.

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