Explanations:The Western Ghats, also known as Sahyadri, is a mountain range that runs parallel to the western coast of India. It is one of the most significant geographical features in the region, stretching from the Tapti River in the north to the Kanyakumari in the south. The Western Ghats are a UNESCO World Heritage Site and are known for their rich biodiversity and unique ecosystems.
In the context of Kerala, the Western Ghats form a natural boundary on the eastern side of the state. This mountain range plays a crucial role in the state's geography, influencing its climate, water resources, and biodiversity. The Western Ghats are characterized by their dense forests, numerous rivers, and diverse flora and fauna. They are also a source of water for many of Kerala's rivers, which are essential for agriculture, drinking water, and hydroelectric power.
The Eastern Ghats, on the other hand, are located on the eastern side of India, running along the eastern coast from the Mahanadi River in the north to the Kaveri River in the south. They are not geographically relevant to Kerala and do not form any boundary with the state.
The Himalayas, the world's highest mountain range, are located in the northern part of India and are not related to the geography of Kerala. They form a natural boundary between India and the Tibetan Plateau and are not geographically connected to the western coast of India.
Therefore, the correct answer is the Western Ghats, which form the eastern boundary of Kerala and are a significant geographical feature of the region.