Definition that contains columbia river
- snake a tributary of the Columbia River that rises in Wyoming and flows westward; discovered in 1805 by the Lewis and Clark Expedition
- clark United States explorer who (with Meriwether Lewis) led an expedition from St. Louis to the mouth of the Columbia River; Clark was responsible for making maps of the area (1770-1838)
- gray American navigator who twice circumnavigated the globe and who discovered the Columbia River (1755-1806)
- lewis United States explorer and soldier who lead led an expedition from St. Louis to the mouth of the Columbia River (1774-1809)
- vancouver a town in southwestern Washington on the Columbia River across from Portland, Oregon
- chinook a member of an important North American Indian people who controlled the mouth of the Columbia river; they were organized into settlements rather than tribes
- willamette a river in western Oregon that flows north into the Columbia River near Portland
- lewis and clark expedition an expedition sent by Thomas Jefferson to explore the northwestern territories of the United States; led by Meriwether Lewis and William Clark; traveled from St. Louis to the mouth of the Columbia River from 1803 to 1806
- william clark United States explorer who (with Meriwether Lewis) led an expedition from St. Louis to the mouth of the Columbia River; Clark was responsible for making maps of the area (1770-1838)
- meriwether lewis United States explorer and soldier who lead led an expedition from St. Louis to the mouth of the Columbia River (1774-1809)