Geography Geek | How did Lewis & Clark know where to go? @GeographyGeek | Uploaded November 2022 | Updated October 2024, 10 hours ago.
On May 14, 1804 The Corps of Discovery led by Captains Merriweather Lewis & William Clark began their journey across western North America, into completely unexplored and unmapped territory. At least that’s what is commonly thought. But was the west really unexplored?

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Book Sources
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"Mapping the West with Lewis & Clark" by Ralph E. Ehrenberg & Herman J. Viola
"Undaunted Courage" by Stephen Ambrose

RareMap.com Sources
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1718 Guillaume De L'Isle - tinyurl.com/4u2zx6w9
1814 Lewis & Clark Map - tinyurl.com/3e9fjf2h
1804 Aaron Arrowsmith - tinyurl.com/3unk2tm6
Aaron Arrowmith Maps - tinyurl.com/2wum3sju