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Borgå å
Origin Salpausselkä
Mouth Gulf of Finland
Basin countries Finland
Length 143 km
Source elevation 68 m
Avg. discharge 1-200 m³/s
Basin area 1 271 km²
Rapid in Orimattila, Virenoja

Porvoonjoki (Porvoo River, Borgå å in Swedish) is a small river in Finland. The Mediaeval town of Porvoo is situated in the river delta.

Coordinates: 60°23′N 25°40′E / 60.383°N 25.667°E / 60.383; 25.667