Mullinhassig Wood & Waterfalls, Aghavrin, Forest and archaeological site in Aghavrin, Ireland

Mullinhassig Wood is a Coillte-owned forest of about 8 hectares straddling Aghavrin and Shanavagha, 4 km north-west of Coachford. It holds Douglas fir, oak, Sitka spruce and Japanese larch. Poulanassig Waterfall, a 30-foot cascade of the Glashnagarriff River, lies 0.75 km west of the entrance and can be seen from the water's edge or a path above. A collapsed clapper bridge stands at the eastern end.

Mullinhassig takes its name from the Irish Muileann an Easaigh, 'mill of the waterfall'. The mill at the head of the glen was a fulling mill, later converted to a creamery; a private residence now stands on the site. The 1842 Ordnance Survey map records the cataract under the name Poulanassig, and the 1901 map likewise names Poulanassig waterfall while calling the glen Mullinhassig.

The waterfalls and surrounding forest hold a place in local folklore, where stories describe a salmon taking the form of a mermaid dwelling in one of the pools. Such tales shape how people experience and speak about the location today.

Walking paths with solid surfaces wind through the forest and lead to the main waterfall, starting from a parking area near the entrance with clear directional signs. The route is straightforward to follow and suitable for most visitors.

The location once had three distinct waterfalls flowing through it, but only two remain visible today. This loss reflects how the landscape has naturally changed over the years.