Kota Bharu, colloquially referred to as KB, is a town in Malaysia that serves as the state capital and royal seat of Kelantan. It is situated in …Kota Bharu, colloquially referred to as KB, is a town in Malaysia that serves as the state capital and royal seat of Kelantan. It is situated in the northeastern part of Peninsular Malaysia and lies near the mouth of the Kelantan River.