Fort Mandan was a historic fort built by the Lewis and Clark Expedition in 1804-1805. Located near the confluence of the Missouri River and Heart River in present-day North Dakota, it served as the expedition's winter camp. The fort was constructed from logs and featured several buildings, including living quarters and storage areas. The fort was named after the Mandan tribe, who were local Native Americans. During their stay, the explorers interacted with the Mandan people, learning about their culture and trading goods. Fort Mandan played a crucial role in the success of the expedition, providing shelter and support during the harsh winter months.