Kalba is a city in the Emirate of Sharjah in the United Arab Emirates. It is an exclave of Sharjah lying on the Gulf of Oman coast north of Oman. Khor Kalba, an important nature reserve and mangrove swamp, is located south of the town by the Omani border. Kalba Mangrove reserve is open to the public and was developed as an eco-tourism resort by the Sharjah Investment and Development Authority. A number of conservationists and ecologists have expressed concern regarding the project.