AbstractThe Terai belt in Nepal's southern part is also called Madhesh/Madesh. However, according to the Nepal Academy, it is an old area between the Himalayas, the Bindhyachal Mountains, and the lowlands between Kurukshetra and Prayagraj. Furthermore, the dictionary compared the Madhesh of Nepal with Madhya Pradesh of India. This term then perplexes the readers. Nepal's political struggle of the same name has grown. Whether or not this definition is accurate. Whether an update is necessary or not. The author will present his viewpoint by reviewing numerous supporting evidence in this article. Based on a thematic analysis of the data, this article evaluates the accuracy of this definition. The study examined secondary data drawn from history and mythology. The findings do not support the definition of the Nepal Academy vocabulary, necessitating a new understanding. This review argues that the Madesh/Madhesh was descended from the Shaivites of ancient Matsya Desh, Mlhechha Desh, and Magadh Desh. According to this assessment, the Madhesh/Madesh in Nepal is not synonymous with Madhya Pradesh in India. Keywords: Madhesh, Terai, Dictionary, Matsya, Mleccha, Magadh, Nepal, India.