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Native name Borgå å
Country Finland
Basin features
Main source Salpausselkä
68 m (223 ft)
River mouth Gulf of Finland
Basin size 1,271 km2 (491 sq mi)
Physical characteristics
Length 143 km (89 mi)
  • Average rate:
    100 to 200 m3/s (3,500 to 7,100 cu ft/s)
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