The Koskenkylänjoki, long known as the Pernajanjoki, is a coastal river in the Pernaja district east of Helsinki, running through agricultural country into the Gulf of Finland at Pernajanlahti bay. Wild brown trout and grayling through the summer season — selective in the way clear small rivers produce, holding in the current margins and behind the larger boulders. In autumn, sea trout run in from the Baltic, holding briefly in the lower pools before pushing upstream on rain. The river is modest in scale. It fishes considerably better than it looks, which is the reliable quality of rivers that people haven't bothered to overrate.

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