Bathymetry water depth survey including Esri raster Grid and contour vector lines at 1m intervals. Data coverage includes Lough Furnace in the Burrishoole catchment Co. Mayo Ireland. Data collected from 2003 survey. Data collected using standard echosounder device gear mounted on the front of a boat for determining the depth of the lake by measuring time taken for sound echoes to return to the listener. The purpose of the survey was to understand the depth profile of Lough Furnace to support ecosystem analysis of the lake catchment. Data collection undertaken by NUI Galway in consultation with the Marine Institute Newport facility. Data coverage 100% of the lake area surveyed.