The Dead Sea is over 430 metres below sea level and dropping about a metre per year.

The Amazon rainforest spans nine countries.

In Switzerland, it is illegal to own just one guinea pig — they are social animals and must have a companion.

Mount Everest is not the closest point to space — that distinction belongs to Mount Chimborazo in Ecuador, due to Earth's equatorial bulge.

Sudan has more ancient pyramids than Egypt — over 200, though smaller in scale.

The Ice Age shaped many of today’s landscapes.

The Sahara Desert receives very little annual rainfall.

Australia is wider than the Moon — the continent spans about 4,000 km coast to coast.

Lake Baikal is the deepest freshwater lake in the world.