Marina Beach is one of the longest natural beaches in the world. It is located in Chennai, India. The beach is 13 kilometers long and is one of the most popular tourist destinations in Chennai. The beach is also a popular spot for locals to relax and enjoy the outdoors.
Rocky headlands are landforms that are formed by the erosion of rocks by waves and currents. They are typically found along coastlines and can be quite dangerous to navigate.
Mangrove ecosystems are coastal forests that are found in tropical and subtropical regions. They are characterized by their ability to grow in saline water and their dense root systems, which help to protect the coastline from erosion.
The highest beaches in India are located in the Himalayas. These beaches are typically very cold and are not suitable for swimming.
Therefore, the correct answer is (a).