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The Hillsborough River is the primary source of drinking water for the City of Tampa. It forms in the tranquil Green Swamp and from here, it travels 54 miles to Florida’s largest open-water estuary, Tampa Bay. Along the way, it passes through rural portions of Pasco, Polk and Hillsborough counties then into residential neighborhoods, a 1,300-acre reservoir and an urban landscape of concrete seawalls and industry. As all rivers do, the Hillsborough River shares an intimate connection with its watershed.