Explanation: Kerala is a state in southern India, known for its lush green landscapes, backwaters, and rich cultural heritage. The state is divided into 14 districts, each with its own unique characteristics and geographical features. The districts are arranged in a north-south orientation, with the southernmost district being Thiruvanathapuram.
Thiruvanathapuram, also known as Trivandrum, is located at the extreme southern tip of Kerala, bordering the Indian Ocean. It is the capital city of the state and is known for its historical and cultural significance, as well as its natural beauty. The district is home to several important landmarks, including the Padmanabhaswamy Temple, the Napier Museum, and the Kovalam Beach.
The other options provided are incorrect for the following reasons:
- Kottayam is located in the central part of Kerala and is known for its backwaters and cultural heritage. It is not the southernmost district.
- Idukki is located in the central-western part of Kerala and is known for its scenic beauty and hydroelectric projects. It is not the southernmost district.
- Kasargod is located in the northernmost part of Kerala and is known for its beaches and historical sites. It is not the southernmost district.
Understanding the geographical layout of Kerala's districts is crucial for identifying the southernmost district. Thiruvanathapuram is the correct answer as it is located at the extreme southern tip of the state, making it the southernmost district of Kerala.