A big landmass which is separated from the rest of the continent due to its distinct geographical features is called a sub continent.
For eg: The Indian sub continent stands out as a distinct geographical unit from the rest of the Asian continent.

Subcontinent Explanation:

A subcontinent is a large landmass that is part of a larger continent but is considered distinct due to its geological, cultural, and political characteristics. Subcontinents are usually separated from the rest of the continent by physical features like mountains, oceans, or plate boundaries.

Why India is a Subcontinent:

India is considered a subcontinent due to several factors that set it apart from the rest of Asia:

- **Geographical Diversity:** India is a vast landmass with diverse geographical features such as the Himalayas in the north, the Thar Desert in the west, the Deccan Plateau in the south, and the Eastern and Western Ghats along the coast. These features separate India from the rest of Asia.

- **Cultural Richness:** India is home to a diverse population with different languages, religions, and traditions. This cultural diversity is distinct from other parts of Asia and contributes to India's identity as a subcontinent.

- **Historical Significance:** India has a long history of civilization dating back thousands of years, with ancient empires, kingdoms, and dynasties shaping its culture and heritage. This rich history adds to India's unique status as a subcontinent.

- **Political Independence:** India gained independence from British colonial rule in 1947 and has since emerged as a sovereign nation with its own government, constitution, and identity. This political independence further reinforces India's position as a subcontinent.

In conclusion, India is considered a subcontinent due to its geographical diversity, cultural richness, historical significance, and political independence, all of which distinguish it from the rest of Asia.