(e.g. Connemara and Erris) is ruggedly inhospitable and not conducive for agriculture. It contains the main mountainous areas in Connacht, including the Twelve Bens, Maumturks, Mweelrea, Croagh Patrick, Nephin Beg, Ox Mountains, and Dartry Mountains. Killary Harbour, one of Ireland's fjords (the others being Carlingford Lough and Lough Swilly), is located at the foot of Mweelrea. Connemara National Park is in County Galway. The Aran Islands, featuring prehistoric forts such as Dún Aonghasa, have been a regular tourist destination since the 19th century. Inland areas such as east Galway, Roscommon and Sligo have enjoyed greater historical population density due to better agricultural land and infrastructure. Rivers and lakes include the River Moy, River Corrib, the Shannon, Lough Mask, Lough Melvin, Lough Allen and Lough Gill. The largest urban area in Connacht is Galway, with a population of 79,934. Other large towns in Connacht are Sligo (19,199), Castlebar (12,068) and Ballina (10,171). History Early history Up to the early historic era, Connacht then included County Clare, and was known as Cóiced Ol nEchmacht. Later myths state the Fir Bolg ruled all Ireland before the Tuatha Dé Danann arrived. When the Fir Bolg were defeated, the Tuatha Dé Danann drove them to Connacht. Sites such as the Céide Fields, Knocknarea, Listoghil, Carrowkeel Megalithic Cemetery and Rathcroghan, all demonstrate intensive occupation of Connacht far back into prehistory. Enigmatic artefacts such as the Turoe stone and the Castlestrange stone, whatever their purpose, denote the ambition and achievement of those societies, and their contact with the La Tène culture of mainland Europe. In the early historic era (c. A.D. 300 – c. A.D. 600), Ol nEchmacht was not a united kingdom but a region. It comprised dozens of major and minor túath; rulers of larger túatha (Maigh Seóla, Uí Maine, Aidhne and Máenmaige) were accorded high-king status, while peoples such as the Gailenga, Corco Moga and Senchineoil were lesser peoples given the status of Déisi. All were termed kingdoms, but according to a graded status, denoting each according the likes of lord, count, earl, king. Some of the more notable peoples or ethnic groups included the following: By the 5th century, the pre-historic nations such as the Auteini and Nagnatae – recorded by Ptolemy (c. AD 90 – c. 168) in Geography – gave way to dynasties. This is demonstrated in the noun moccu in names such as Muirchu moccu Machtheni, which indicated a person