Notes

Large parts of the tropics are so lushly vegetated that underlying rocks are not easy to see. Nonetheless, this region -- a belt along the equator between the Tropic of Cancer and the Tropic of Capricorn -- features a diversity of striking landforms, from rolling plains to massive mountains. Climatically, the tropics are generally defined by year-round warmth and high humidity, which encourages both profuse vegetation and plenty of water to sculpt the landscape.
Inselbergs
Isolate outcrops of resistant rock that loom above surrounding terrain are called inselbergs, and while they are not restricted to the tropics by any means, some spectacular examples lie in this climatic zone. For example, in parts of central and west-central Africa, massive granite inselbergs rear from lowland rain forest and deep swamps. Such monoliths derive from differential rates of weathering and erosion, with less-resistant layers of rock and sediment being whittled away while the more durable masses remain.
High Mountains
Some of the highest elevations in the tropics are at the summits of great lone volcanoes, from the Rift Valley cones of East Africa to the fire islands of the Hawaiian archipelago.
Waterfalls
The generous precipitation of the tropics translates to large and numerous rivers and streams, including some of the biggest in the world, like the Amazon and Congo. Waterfalls and cataracts commonly form where resistant rock layers are exposed in the river channel.
Wetlands
Some of the planet’s great wetlands are in the tropics. Largest of all is South America's Pantanal, a vast landscape of marshes and seasonally-flooded savanna and grasslands occupying a broad topographic depression, fed by the Paraguay River and its tributaries.