We have measured Hg concentrations in one of the most remote aquatic systems in the world, Taylor Valley (~78 ¿S), Antarctica. These measurements, along with the previous work of Vandal et al. [1998>, provide baseline concentrations of Hg, as well as an assessment of Hg speciation, in a remote aquatic environment. Dissolved Hg concentrations in the surface waters of these lakes and glacial streams range from 0.10 to 0.44 ngL-1. These values are similar to those reported from other remote locations and suggest these values represent current baseline values globally. ¿ 1999 American Geophysical Union