Explanations:Estuaries are formed where rivers meet the sea, creating a unique environment where freshwater from the river mixes with saltwater from the ocean. This mixing creates a brackish water environment that is distinct from both freshwater and saltwater environments. Estuaries are important ecosystems that support a wide variety of plant and animal life.
In the context of Gujarat, several rivers form estuaries along its coast. The Tapi and Narmada rivers are notable examples. The Tapi river, which originates in the Satpura Range in Madhya Pradesh, flows westward and forms an estuary in the Gulf of Khambhat, which is part of the Arabian Sea. Similarly, the Narmada river, which also originates in Madhya Pradesh, flows westward and forms an estuary in the Gulf of Khambhat.
However, the Mahanadi river, which is not one of the rivers that flow into Gujarat, does not form an estuary in Gujarat. The Mahanadi river originates in the Eastern Ghats in Odisha and flows eastward into the Bay of Bengal. Therefore, it does not contribute to the estuarine systems along the Gujarat coast.
Understanding the geographical distribution of rivers and their estuaries is crucial for comprehending the ecological and geographical features of a region. In this case, the Mahanadi river's location in the eastern part of India, far from the Gujarat coast, means it does not form an estuary in Gujarat.