Kochi is a city in the state of Kerala, in India. It used to be called Cochin. It is also called the "Queen of the Arabian Sea". The city has the most people after the capital city of Kerala, Trivandrum. Kochi is the financial and commercial hub of the state. Kochi has a very old synagogue. It is usually called by the name Ernakulam, which is the mainland part of the city. Most regions in Kochi are at sea level. It has a coastline of almost 48 kilometres (30 miles). Kochi is the seat of the High Court of Kerala.