The Matanzas karst to the east of Havana has some remarkable caves. The Cueva del Gato Jibaro is 11 km long. Whilst the Cueva de Bellamar has some fabulous calcite crystals over 50 cm long. The Cueva Santa Catalina is renown for its cave mushrooms which are over a metre in height. They are composed of fragments of calcite 'ice' which forms on the gours pools.