Concept notes: Estuaries are formed where rivers meet the sea, creating a brackish water environment. In Gujarat, the Tapi and Narmada rivers form significant estuaries. The Mahanadi, however, is located in the eastern coast of India, primarily in Odisha, and does not form an estuary in Gujarat.
Explanation: To understand the concept of estuaries and their formation in the context of Gujarat, it is essential to first define what an estuary is. An estuary is a partially enclosed coastal body of water where freshwater from rivers and streams meets and mixes with saltwater from the ocean. This mixing of fresh and saltwater creates a unique and dynamic environment that supports a wide range of plant and animal life.
In the context of Gujarat, the state is located on the western coast of India, bordering the Arabian Sea. The rivers that form estuaries in Gujarat are primarily the Tapi and the Narmada. The Tapi river originates in the Satpura Range in Madhya Pradesh and flows through Maharashtra and Gujarat before emptying into the Gulf of Khambhat. Similarly, the Narmada river, which is one of the major rivers of central India, originates in the Amarkantak Plateau in Madhya Pradesh and flows westward through a rift valley before draining into the Gulf of Khambhat.
The estuaries formed by these rivers are significant for several reasons. They provide important habitats for various species of fish, birds, and other wildlife. They also play a crucial role in the local economy, supporting activities such as fishing and tourism. Additionally, the estuaries contribute to the overall ecological balance of the region by acting as natural buffers against coastal erosion and flooding.
In contrast, the Mahanadi river, which is not located in Gujarat, is a major river in eastern India, primarily flowing through the state of Odisha. It empties into the Bay of Bengal, forming an estuary in the eastern coastal region of India. Therefore, the Mahanadi does not form an estuary in Gujarat, making it the correct answer to the question.
Understanding the geographical distribution of rivers and their estuaries is crucial for comprehending the coastal geography of a region. It helps in identifying the ecological, economic, and environmental significance of these water bodies and their impact on the surrounding areas. In the case of Gujarat, the estuaries formed by the Tapi and Narmada rivers are integral to the state's coastal ecosystem and economy.