Topographically, a remarkable feature of Galicia is the presence of many firth-like inlets along the coast, estuaries that were drowned with rising sea levels after the ice age. These are called rías and are divided into the smaller Rías Altas ("High Rías"), and the larger Rías Baixas ("Low Rías"). The Rías Altas include Ribadeo, Foz, Viveiro, Barqueiro, Ortigueira, Cedeira, Ferrol, Betanzos, A Coruña, Corme e Laxe and Camariñas. The Rías Baixas, found south of Fisterra, include Corcubión, Muros e Noia, Arousa, Pontevedra and Vigo. The Rías Altas can sometimes refer only to those east of Estaca de Bares, with the others being called Rías Medias ("Intermediate Rías").