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Paimionjoki long kayaking segment (Koski Tl–Somero lake area)

—•Kayaking Routes

73.6 km

Route

Description

Paimionjoki association – Canoeing and recreation+

Description

The mapped line is about 73.6 km as one continuous paddling path on the Paimionjoki system in Southwest Finland—it is not a loop. The Paimionjoki is one of southern Finland’s longest waterway routes; the full river corridor is described as roughly 110 km from Somero’s lake chain to Paimionlahti, and the lower valley is a nationally valuable landscape. The Paimionjoki association states that paddling the entire river requires experience because rapids and dam structures slow progress, while shorter sections can suit beginners. Silver River’s description adds that the river is wide and mostly gently flowing, but there are many rapids and dam structures, and completing the whole river takes several days and advance planning. This mapped line connects Koski Tl with the Somero lake area (ending near Pitkäjärvi beach)—effectively a long upper- and middle-river segment, whereas reaches toward the sea at Paimio and short city paddles are often described separately. Tammireitit describes the easy Paimio–Jokipuisto-to-sea trip for families (the roughly 9 km short route is listed as a separate Paimionjoen melontareitti); this page focuses on a long-distance style section. Johanna Liipola’s Hoods blog post about a four-day SUP paddle from Somerniemi to Paimio shows how the Paimionjoki shifts from lake-like water to narrower river channel, and how passing dams and rapids means carrying boats and solid route judgment. On Somero’s lake sections the view can feel like open water; near Koski town the river narrows, and toward Tarvasjoki and Marttila the landscape follows the historic Hämeen Härkätie cattle road. Use Virma maps for landings, rapids, and flow information when planning, and always confirm water levels and dam passages on site. For the most up-to-date official information on recreation use, services, and association materials, start from the Paimionjoki association’s paddling pages.

Length & route

The mapped line is about 73.6 km as one continuous paddling path along the Paimionjoki system between Koski Tl and the Somero lake area near Pitkäjärvi beach. The full Paimionjoki waterway is described in the literature as roughly 104–110 km from the Somero lake chain to Paimionlahti; the upper and middle sections are wide river and lake water with many rapids and dam structures that require portages and scouting. Silver River notes about fifteen rapids on the river, six of which are dammed, and recommends studying the river’s paddling guide before long trips.

Getting there

Plan put-in and take-out with Virma maps for legal landings and road access, and match vehicle shuttles to your chosen direction along the river. For equipment delivery and route advice on the whole river, Silver River Adventure Centre in Marttila advertises canoe and kayak transport across the Paimionjoki area and sells a paddling guide for the river. The Paimionjoki association’s paddling page lists rental and instruction providers in the river basin, including Silver River in Marttila and Paimion Melonta- ja matkalupalvelut in Paimio. Our page on this route shows the line geometry and nearby towns for orientation.

Good to know

Finnish Wikipedia summarises Paimionjoki hydrology, dams, small hydropower plants and restoration projects affecting rapids and fish passage—useful background when planning portages and understanding regulated flow. Fishing requires the national fisheries management fee and any local association permits that apply to the water you fish; check rules for the exact stretch. Respect private shores and landing restrictions: for example, Tammireitit notes that at Rantala camp centre paddlers may only land when the parish is not running its own activities there.

Itinerary

For a ~4-day reference pace similar to a documented full-river SUP journey, the first long lake section in the Somero area can feel like open water paddling before the channel narrows toward Koski Tl; Koski and Marttila sections mix fields, rapids, and mill heritage, and Tarvasjoki–Lieto reaches include power plants and carries that must be scouted. Align daily distance with your group, portage time at dams, and weather. The mapped 73.6 km segment can be split into two or three full days for experienced paddlers or more if you shorten daily hours; beginners should stick to shorter municipal sections such as the Jokipuisto-to-sea trip described for Paimio rather than this long line.

Where to rent kayaks

Silver Seikkailu ja Silver River Melontakeskus (Marttila, Prunkila) offers kayaks, canoes, and SUP boards, rental gear, guided trips on the Paimionjoki including transport, and a river paddling guide for purchase—contact via the centre’s paddling pages. Paimion Melonta- ja matkalupalvelut in Paimio is listed on the Paimionjoki association page; details are published through their social channels.

Guided tours & Experiences

Silver River schedules guided group paddles on the Paimionjoki (e.g. Jokipuisto-based tours) and sells multi-day packages such as Marttila–Paimio with portages past power plants and rapids—see their calendar and pricing on the Melonta ja SUP section.

Managed by

Marttila

Official Maintenance

Trail info

Paddle in the direction that matches your vehicle shuttle and the current on the day. Downstream on the Paimionjoki runs from the Somero lake chain toward Paimio and the sea; upstream travel is common when staging a car at Somero and finishing toward Koski Tl or the opposite, depending on your plan.

Route direction

Recreation Area

Lake

River

Open / Good Condition

Paimionjoki association – Canoeing and recreation+

Activities allowed

Kayak / Canoe

Activity

Terrain & conditions

73.6 km

Distance

For the full ~110 km river, multi-day sources suggest planning roughly three to five days on the water depending on skill, portages, and daily hours. For this mapped ~73.6 km segment alone, expect at least two long paddling days for experienced groups or three or more days at a moderate pace.

Est. Time

Point-to-Point

Route Type

Has Portages

Portage

Class I (Easy)

Rapids class

Class II (Moderate)

Rapids class

Lake Paddling

Water type

River Paddling

Water type

Silver River Adventure Centre – kayaking and SUP (Marttila)+

Location

60.55246°N, 22.68212°E

Approximate location

FinlandCountry

Southwest FinlandRegion

Koski TlCity

Kayaking RoutesCategory

Explore nearby

Tarvasjoen urheilukenttä

611 m

Tarvasjoen koulun liikuntasali

253 m

Auranmaan Tekojäärata

467 m

Kylämäen Hevostilan kenttä

320 m

Nooran tallin kenttä

495 m

Marttilan Ollilan nurmikenttä

216 m

Free

Keskustan pesäpallokenttä

616 m

Free

Pitkäjärven uimaranta Somero

445 m

Free

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Answers to your questions

Our data was researched from Marttila, and other trusted sources, in March 2026. Our route / place GPX data comes from Metsähallitus / Lipas, last updated March 2026. Always check their official website for safety-critical updates.

Finland Southwest Finland Koski Tl Kayaking RoutesPaimionjoki long kayaking segment (Koski Tl–Somero lake area)