Which of the Great Lakes is the largest by surface area and also the largest freshwater lake in the world by that measure?

Which famous natural wonder was carved by the Colorado River over millions of years?

Which river, the longest in Canada, flows north to the Arctic Ocean?

Niagara Falls consists of three waterfalls. Which is the largest and most powerful?

In which state is the Great Salt Lake, one of the saltiest bodies of water in the world, located?

In which state does Yosemite Falls, one of the tallest waterfalls in North America at over 2,400 feet, descend?

The Columbia River forms much of the border between which two US states?

Lake Mead, the largest reservoir in the US by capacity, straddles the border of Nevada and which other state?

Which Great Lake is located entirely within the United States?

In which state is Lake Okeechobee, the largest freshwater lake in the southeastern US, found?