Thickness of the Last Glacial Maximum (LGM) deposit. Contours are presented as depth (metres) below present seafloor or the base of the post LGM sedimentary cover. LGM is defined on average at 18,000 years BP. In glaciated regions the thickness of the Holocene is used. Confidence is defined as follows: 1. High: Sampled feature with good age and palaeoenvironmental control. 2. Sampled feature with poor or none age and palaeoenvironmental control. 3. Constructed by remote sensing data only, 4. Low: Reasonable without any direct evidence