River Walk and Ross Castle Loop

River Walk and Ross Castle Loop is an approximately 8 km (5 mile) circuit from Deenagh Lodge through Knockreer, Cotter’s Field, the Deenagh River and Lough Leane shore to Ross Castle, then back inland. It is a gentle half-day walk rather than a hill hike: most of it is level, with a rise and drop early on and firmer gravel or dirt underfoot in a few places. Allow about 2½ hours for the walk and stops; touring the castle is extra. Ross Castle comes around the middle, and the return retraces part of the lakeshore before turning inland.

The official Knockreer Circular Walk is a separate, shorter 5 km circuit from Killarney House and Gardens; it does not include the Ross Castle extension.

Start behind Deenagh Lodge and climb toward Knockreer House. The first rise is the main uphill effort; after it, the path rolls gently through estate parkland. When the trees open, look across Lough Leane to the MacGillycuddy Reeks. At the first cattle grid, the Fossa Way branches toward Castlerosse; stay on the Ross Castle route. Cotter’s Field opens into meadow, where red deer and Kerry cattle are often seen.

Cross the Deenagh River and follow its bank toward Lough Leane. The shore path has intermittent views through the trees, then opens around Innisfallen Island and an old lime kiln before the first clear look at Ross Castle. For a photo, frame the castle across the water with the island in view from the open shore. This stretch has little shelter and the low path can flood after heavy rain or high lake levels.

The lakeside approach reaches Ross Castle before the loop turns back. The path is shared near the castle with pedestrians, runners, buggies and jaunting cars, so pay attention as you walk. After retracing the shore to the earlier junction, the return leaves the lake through marshy ground and rhododendron, then heads past Killarney House and the Deenagh bridge to the lodge. Dogs are allowed on park trails; keep them on a lead.

Deenagh Lodge has a seasonal coffee shop, and Ross Castle has public toilets and a summer snack shop or café. The castle interior is a separate seasonal guided tour, not part of the walking route.

Knockreer House now holds the park’s education centre. It stands on the site of the original Killarney House, which burned in 1913; old walls and steps remain in the gardens. They give the open parkland around the walk a visible trace of its former estate use.

Ross Castle is a fifteenth-century tower house, probably built by O’Donoghue Mór. A local legend says he sleeps beneath the lake and rises every seven years on a white horse. The castle also held out late in the Cromwellian conquest of Munster: its defenders believed prophecy said it could only be taken by water, until General Ludlow brought a boat onto Lough Leane.