1. The biggest island in the world is Greenland.
2. The longest river in the world is the Nile.
3. The widest river in the world is the Amazon.
4. The biggest lake in the world is the Caspian Sea.
5. The deepest lake in the world is Lake Baikal.
6. The longest mountain range in the world is the Andes.
7. The highest peak in the world is Everest.