Jamnagar is a city and a municipal corporation, located in Jamnagar district, in the Indian state of Gujarat. Jamnagar is the fifth largest city in the Indian state of Gujarat after Ahmedabad, Surat, Vadodara and Rajkot And 79thth urban Metropolitan City in India The city was built up substantially by Maharaja Kumar Shri Ranjitsinhji in the 1920s, when it was known as Nawanagar. The city lies just to the south of the Gulf of Kutch and is 337 km west of the state capital, Gandhinagar. Recently, Jamnagar has shot to prominence as Reliance Industries, India's largest private company, established the world's largest oil refinery near the village of Moti Khavdi in Jamnagar. It is also home to an Essar Oil refinery, located near the town of Vadinar. Jamnagar has consequently been nicknamed the 'Oil City of India'.