Finland's national park trail network allows international backpackers to hike 50 to 100+ kilometer multi-day routes while sleeping every single night in 100% free open log wilderness cabins (autiotupa) or wooden lean-to shelters (laavu)—no cabin booking fees required.
- The Bear's Trail (Karhunkierros, 82 km) — Oulanka National Park: Explore 133 Kuusamo & Oulanka Huts on Map
- Hetta–Pallas Trail (55 km) — Pallas–Yllästunturi National Park: Explore Enontekiö & Pallas Huts on Map
- Urho Kekkonen National Park (UKK) — Saariselkä & Kiilopää: Explore Inari & UKK Huts on Map
- Herajärven kierros (30–61 km) — Koli National Park: Explore Lieksa & Koli Huts on Map
Karhunkierros (The Bear's Trail, 82 km) — Kuusamo & Salla
Located in Kuusamo (133 shelters) and Salla (95 shelters), Oulanka National Park's 82 km Karhunkierros is Finland's most famous trek. The trail crosses roaring canyon rapids (Kiutaköngäs, Niskakoski, Taivalköngäs) on hanging suspension bridges and links a chain of free open wilderness cabins: Savilampi, Taivalköngäs, Jussinkämppä, Kulmakkopuro, Ansakämppä, Siilastupa, and Porontimajoki. For a 1-day trip, the 12 km Pieni Karhunkierros (Little Bear's Trail) passes Siilastupa and Harrisuvanto.
Koli National Park & Eastern Finland (Lieksa, Joensuu & Kuhmo)
Rising above Lake Pielinen in Lieksa, Koli National Park's iconic quartzite summits inspired Jean Sibelius. Along the Herajärven kierros loop trail, hikers find free lakeside laavu shelters (Lakkala, Rykiniemi, Huuhkajavaara, Kiviniemi) and historic forest cabins, while nearby Kuhmo (114 shelters) offers wild taiga lakes along the eastern border.