A continent is a large continuous expanse of land on the Earth's surface. Continents are surrounded by water but are so large that they are not considered islands. The most commonly accepted count is seven continents: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.

An ocean is a vast water body that covers a major portion of the Earth's surface. Oceans are the largest water bodies on Earth and are interconnected with each other. There are five oceans: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Arctic Ocean, and the Southern (Antarctic) Ocean.

An island is a smaller piece of land surrounded by water on all sides. Unlike continents, islands are smaller in size. There are lakhs of islands on the planet, varying greatly in size. Greenland is the largest island in the world.