Lough Carra is a shallow, predominantly spring-fed lake in County Mayo in the west of Ireland. It is widely recognized as one of the finest examples of a marl lake habitat in Ireland and in Europe, distinguished by its turquoise and aquamarine waters and the calcareous (marl) encrustations that coat its rocky lake floor and shoreline. The lake forms part of the Lough Carra/Mask Complex Special Area of Conservation (SAC) and the Lough Carra Special Protection Area (SPA), reflecting its exceptional ecological and conservation status.

The lake's shores are fringed with a complex of limestone and wetland habitats, including limestone pavements, orchid-rich grasslands, and fens. Wildlife of note includes the lesser horseshoe bat, Eurasian otter, and common gull, making the shoreline of particular interest to paddlers attentive to natural surroundings. The lake is also well known among fly anglers for its brown trout fishing, particularly during the mayfly season, so paddlers should be aware of angling activity on the water.

Paddling has been undertaken on the southern part of the lake, with at least one documented trip launching from that area. The lake's shallow, clear character means the marl bottom is often visible, contributing to the distinctive blue-green appearance of the water. However, the lake has experienced water quality deterioration due to eutrophication, and it was designated a Priority Area for Action under Ireland's River Basin Management Plan 2018–2021, with ongoing catchment management work underway.

Given its status as a protected SAC and SPA, paddlers should be mindful of the lake's sensitive ecology and any access or usage regulations that may apply to protected areas in Ireland. The lake sits in proximity to Loughs Mask and Corrib, and the broader area is being developed as part of the Joyce Country and Western Lakes Geopark project, which may add further context for those exploring the region by water.