The centuries long forge ( ironwork ) network linked to readily available timber , abundant waterways , and proximity of coastal harbours saw its final agony .
Some kept operating -- north of Navarre , Gipuzkoa , Biscay .
The centuries long forge ( ironwork ) network linked to readily available timber , abundant waterways , and proximity of coastal harbours saw its final agony , but some kept operating -- north of Navarre , Gipuzkoa , Biscay .