Castlemaine Harbour is a vast, dynamic estuary located at the head of Dingle Bay in County Kerry, nestled between the Dingle and Iveragh Peninsulas. This is a place of immense ecological importance and angling potential, characterized by a complex and ever-changing landscape. The harbour is a transition zone where the fresh water and sediment from the River Laune and River Maine mix with the salt water, tides, and waves of the Atlantic. This creates a rich mosaic of habitats including extensive mudflats, sandbanks, saltmarshes, and winding channels. The area is protected from the full force of the ocean by tall sand dunes, which also contribute to the formation of renowned sandy beaches like Rossbeigh Strand. The entire ecosystem is designated as a Ramsar Wetland of International Importance, a Special Area of Conservation, and a Special Protection Area, underscoring its critical role for wildlife. For the angler, this translates to a nutrient-rich environment that supports a diverse range of fish species, with fishing opportunities available from shore, boat, and within the freshwater river systems that feed the estuary.