Hernando de Soto was a Spanish explorer who led the first European expedition to discover the Mississippi River in 1541.

The Mid-Atlantic Ridge is the longest mountain range on Earth, stretching for over 10,000 miles through the Atlantic Ocean.

Roald Amundsen was a Norwegian explorer who led the first successful expedition through the Northwest Passage in 1903-1906.

The Challenger Deep is the deepest point in the ocean, located in the Mariana Trench in the western Pacific Ocean.

John Speke was a British explorer who discovered the source of the Nile River in 1862.

Lake Baikal is the largest freshwater lake in the world by surface area, located in southern Siberia, Russia.

James Cook was a British explorer who discovered the Great Barrier Reef in 1770.

The Pacific Ocean is the largest ocean in the world, covering over one-third of the Earth's surface.

Francisco de Orellana was a Spanish explorer who discovered the Amazon River in 1541.

The Nile River is the longest river in the world, flowing for over 6,600 kilometers through northeastern Africa.

Vitus Bering was a Russian explorer who discovered the Bering Strait in 1728.

Victoria Falls is the largest waterfall in the world by volume, located on the Zambezi River between Zambia and Zimbabwe.

Henry Morton Stanley was a Welsh-American explorer who discovered the source of the Congo River in 1877.

The Caspian Sea is the largest inland sea in the world, located between Europe and Asia.

Vasco Nunez de Balboa was a Spanish explorer who discovered the Panama Canal in 1513.