Hello, I'm an expert in geography and history. The Lewis and Clark Expedition, also known as the Corps of Discovery, was an exploratory mission undertaken by the United States from 1804 to 1806. It was led by Meriwether Lewis and William Clark and is famous for being the first American expedition to cross the western portion of the country and reach the Pacific Ocean.

The term "Lewis and Clark" can refer to several things:

1. The expedition itself, which was a journey across the North American continent.
2. The National Historic Trail that follows the route taken by the Corps of Discovery.

3. Lewis and Clark National Historical Park located in Washington State, which commemorates the expedition.

4. Lewis and Clark College, an institution of higher learning in Portland, Oregon.
5. Various books, films, and other media that explore the expedition and its leaders.

If you're asking about the location of the expedition's trail or the national park, they are located in the western United States, with the trail stretching from Wood River, Illinois, to the mouth of the Columbia River at the Pacific Ocean in present-day Oregon.

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Lewis and Clark. Meriwether Lewis and William Clark, at the request of President Thomas Jefferson, led an expedition to survey the land West of the Mississippi, known as Louisiana Territory, that had been purchased from France in 1803.read more >>