The Spanish Arch and the Caoċ Arch in Galway city, Ireland, are two remaining arches on the Ceann an Bhalla. The two arches were part of the extension of the city wall from Martin's Tower to the bank of the River Corrib, as a measure to protect the city's quays, which were in the area once known as the Fish Market. It was constructed during the mayor…The Spanish Arch and the Caoċ Arch in Galway city, Ireland, are two remaining arches on the Ceann an Bhalla. The two arches were part of the extension of the city wall from Martin's Tower to the bank of the River Corrib, as a measure to protect the city's quays, which were in the area once known as the Fish Market. It was constructed during the mayoralty of Wylliam Martin in 1584, being called ceann an bhalla.