Editing Freshwater eutrophication index (section)

== Geographic / System Context ==
The freshwater eutrophication index applies broadly to inland freshwater systems worldwide, including lakes, rivers, reservoirs, and wetlands. It is not restricted to a specific geographic region but rather encompasses diverse freshwater environments where nutrient enrichment and associated water-quality degradation occur. These ecosystems vary widely in their hydrology, nutrient inputs, and ecological responses, making a generalized index useful for comparative and integrative assessments across spatial scales.