Luni River in the context of Jodhpur district

The Rann of Kutch (IPA: [ɾən...kət͡ːʃʰ]) is a large area of salt marshes that span the border between India and Pakistan. It is located mostly in the Kutch district of the Indian state of Gujarat, with a minor portion extending into the Sindh province of Pakistan. It is divided into the Great Rann and Little Rann. It used to be a part of the Arabian Sea, but it then dried up, leaving behind the salt, which formed the Rann of Kutch. The Luni flowed into the Rann of Kutch, but when the Rann dried up, the Luni was left behind, which explains why the Luni does not flow into the Arabian Sea today.

With a land area of 3,287,263 km (1,269,219 sq mi) consisting of diverse ecosystems, India has many rivers systems and perennial streams. The rivers of India can be classified into four groups – Himalayan, Deccan, Coastal, and Inland drainage. The Himalayan rivers, mainly fed by glaciers and snow melt, arise from the Himalayas. The Deccan rivers system consists of rivers in Peninsular India, that drain into the Bay of Bengal and the Arabian Sea. There are numerous short coastal rivers, predominantly on the West coast. There are few inland rivers, which do not drain into sea.

Most of the rivers in India originate from the four major watersheds in India. The Himalayan watershed is the source of majority of the major river systems in India including the three longest rivers–the Ganges, the Brahmaputra and the Indus. These three river systems are fed by more than 5000 glaciers. The Aravalli range in the north-west serves the origin of few of the rivers such as the Chambal, the Banas and the Luni rivers.

The Mahi (माही नदी) is a river in western India. It rises in Madhya Pradesh and, after flowing through the Vagad region of Rajasthan, enters Gujarat and flows into the Arabian Sea. It is one of the relatively few west-flowing rivers in India, alongside the endorheic Luni River, the Sabarmati River, the Tapi River and the Narmada River. Most peninsular rivers in India flow eastward into the Bay of Bengal or northward into the Ganges River.

It has given its name to the Mahi Kantha agency of Bombay, and also to the mehwasis, marauding highlanders often mentioned in Arabian chronicles.