Did you know that 71% of Earth’s surface is covered by water while 97% of that is saltwater and only 3% is freshwater. That’s why Earth is predominantly blue when seen from outer space, and the reason we call it the “Blue planet”.

The biggest ocean is the Pacific with a surface area of 155,557,000 km².

The deepest place on the planet is the Mariana Trench near Guam, that is  11,022 m bellow the surface of the sea.

The tallest mountain on Earth is Mauna Kea (on Hawaii) – measured from the sea floor it’s 10,203 m high (Mount Everest measures 8,848 m high from sea level).

The biggest lake in the world is the salty Caspian Sea (370,999 km²). Out of freshwater lakes, the biggest is the Lake Superior (82,414 km²) that is located in Canada.

The Lake Baikal in Russia holds the title of the deepest lake on Earth (1,680 m). It’s also the oldest lake on Earth with an estimated age of 25 to 30 million years.