Jamnagar The city was built up substantially by Maharaja Kumar Shri Ranjitsinhji in the 1920s, when the district was known as Nawanagar. The district lies just to the south of the Gulf of Kutch. Jamnagar has shot to prominence as Reliance Industries, India's largest private company, established the world's largest refinery near Moti Khavdi village.[1] It is also home to Essar Oil, another important oil refinery of India.[citation needed] The city is also known for featuring India�s only Ayurvedic university.