2023 Map of Galloo Island

About this map

Galloo Islands dominate the eastern reaches of Lake Ontario in this modern survey of Jefferson County. The largest landmass is defined by a central marshy interior and sheltered coastal features like Gill Harbor on its eastern shore and North Pond to the north. To the southwest, the smaller Little Galloo Island and the submerged hazard of Galloo Shoal illustrate the navigational character of this maritime landscape. The surrounding waters, including the Galloo Basin and the approach to the Saint Lawrence Channel, are mapped with precision, showing the isolation of these islands within the Great Lakes system. This map provides a clear view of the contemporary shoreline and wetland distributions as they exist today, serving as a primary reference for the geography of these offshore landforms.