Kochi, also known as Cochin (ko-chin), is a major port city on the south-west coast of India by the Arabian Sea and the Laccadive Sea and is part of the district of Ernakulam in the state of Kerala. It is often called Ernakulam, which refers to the mainland part of the city. With a corporation limit population of 612,343 and metropolitan population of 2.44 million, it is the second largest city in Kerala after Thiruvananthapuram and the largest urban agglomeration in Kerala.