The state of Ohio is bordered to the north by Lake Erie, the shallowest and southernmost of the five Great Lakes. This ~312-mile shoreline forms Ohio's entire northern boundary, separating it from the Canadian province of Ontario.
Lake Erie drives the region's economy and identity. Major port cities—Cleveland, Lorain, Sandusky, Toledo—anchor shipping, manufacturing, and tourism. The lake supports a $1.4 billion sport fishery (walleye, perch, bass) and provides drinking water for 11 million people. Its wetlands filter runoff and shelter migratory birds.
Phosphorus-driven harmful algal blooms, invasive species (zebra mussels, round gobies), and climate-driven water-level fluctuations threaten the lake's health. Ohio's H2Ohio initiative and binational Great Lakes agreements target nutrient reduction and habitat restoration to secure this vital resource.