An outline map showing the various mountain features and plains on the African continent. The map has reference numbers to the prominent features, and includes the inland drainage basin of Lake Tchad.

A map from 1916 of the Illinois River drainage basin showing the primary and secondary tributaries from Lake Michigan to the Mississippi River.

The Formative Period (1500 BCE-300 CE) of Mesoamerican culture is surveyed with an overview of the Olmec culture. Includes discussion of Olmec stone head sculpture, art, building, writing, and other achievements.

Learn all about watersheds in this text based article. What are they? Where are they found? What purpose do they serve?

A map from 1901 of Europe, showing the physical features of the region. This map is color-coded to show general elevations from sea level to over 6,500 feet, mountain systems, drainage divides, lakes, rivers, coastal features, and the...

A map of Asia from 1901 showing the physical features of the region including mountain systems, plateaus, basins, plains, deserts, lakes, rivers, and coastal features and islands. The map shows major ocean currents, the mean annual...

A map from 1901 of North America, Central America, the Caribbean, and Greenland showing general land elevations, mountain systems, rivers, coastal features, and ocean currents. The map is color-coded to show land elevations ranging from...

A map from 1901 of the United States showing the physical features of the area, including mountain systems and highlands, plateaus, basins, plains, lakes, rivers, and coastal features. The map is color-coded to show land elevations from...

The Okapi Wildlife Reserve occupies about one-fifth of the Ituri forest in the north-east of the Democratic Republic of the Congo. The Congo river basin, of which the reserve and forest are a part, is one of the largest drainage systems...