Gwydir Castle is situated in the Conwy valley, Wales, a mile to the west of the ancient market town of Llanrwst and 1.5 miles (2.4 km) to the south of the large village of Trefriw. An example of a fortified manor house dating back to c. 1500, it is located on the edge of the floodplain of the river Conwy, and overlooked from the west by the now-forested slopes of Gwydir Forest.

Llanrwst is a market town and community on the A470 road and the River Conwy, in Conwy County Borough, Wales, and the historic county of Denbighshire. It developed round the wool trade and became known also for the making of harps and clocks. Today, less than one mile from the edge of Snowdonia, its main pursuit is tourism. Notable buildings include almshouses, two 17th-century chapels, and the Parish Church of St Grwst, which holds a stone coffin of Llywelyn the Great. The 2011 census gave it a population of 3,323.