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Great Castle Hill trail 5

—•Hiking Trails

0.1 km

Description

Luontoon.fi – Iso Linnamäki polku 5 (Porvoo)+

Description

Great Castle Hill trail 5 (Iso Linnamäki polku 5) is a very short hiking loop of about 0.1 km on Iso Linnamäki, the large medieval hillfort beside Old Porvoo and the Porvoo River in Porvoo, Uusimaa. This segment is one of the numbered micro-paths on the wooded fortress crown; the trail-specific outdoor listing is on Luontoon.fi. The City of Porvoo describes Pikku Linnamäki’s Iron Age burial ground and Iso Linnamäki as Finland’s largest ancient hillfort, in use from about 700 CE through the 1300s, with the hills protected under the Archaeological Act. Visit Porvoo highlights Iso Linnanmäki as a quick escape from the old town: concentric paths, footbridges over dry moats, and wooden steps toward viewpoints over the rooftops. Visit Finland adds practical colour—twisted pines, bridges over the old moats, and Maari Park at the foot of the hills for picnics. Upe Nykänen’s Porvoo National Urban Park walk on Retkipaikka describes approaching through Maari’s wetlands, crossing a small arch bridge, climbing stairs, and crossing moats on wooden footbridges before standing on the medieval fortress platform—useful context for how these short paths feel underfoot. On the ground, this loop ties together the other Iso Linnamäki strands: Iso Linnamäki polku 1, Iso Linnamäki polku 2, Iso Linnamäki polku 3, Iso Linnamäki polku 4, Iso Linnamäki ylävallin polku on the upper earthwork, and Iso Linnamäki alavallin polku on the lower rampart ring—handy when you want history in bite-sized pieces. Linnanmäen heittokenttä, the municipal throwing field off Linnanmäentie, sits a short distance from the line and works well as a landmark when reading the map.

Length & route

The trail is about 0.1 km as one tiny loop on Iso Linnamäki. Surfaces match the rest of the hill network: forest footpath, short wooden bridges where lines cross the dry moats, and occasional steps. It is only one numbered strand among Iso Linnamäki polku 1–4, Iso Linnamäki ylävallin polku, and Iso Linnamäki alavallin polku—string them together for a longer wander.

Getting there

The loop lies on Iso Linnamäki north of Old Porvoo (trail geometry centres near 60.400°N, 25.653°E). Visit Porvoo suggests about a five-minute walk from the old town to the foot of the hill, then following the concentric paths upward. Many visitors approach from the Maari side along wetland paths as in the Retkipaikka narrative. Wear sturdy shoes; slopes and bridges can be slippery after rain. The City of Porvoo links a map focus for the castle hills in its national urban park materials.

Good to know

The castle hills are protected ancient monuments—stay on paths, avoid digging or moving stones, and treat ramparts gently. There is no dedicated campfire infrastructure on the archaeological crown; picnics fit better in Maari Park at the base.

History

The City of Porvoo notes that Pikku Linnamäki holds an Iron Age burial area (about 100 BCE–300 CE) when the site was still a low island in a narrow sea bay, while Iso Linnamäki is described as Finland’s largest ancient hillfort, in use from about 700 CE through the 1300s, with the hills protected under the Archaeological Act. Timber castle buildings have not survived; visitors mainly experience earthworks, moats, and forested viewpoints.

Managed by

Porvoo

Official Maintenance

+358 40 489 9801

GPX data from: © Metsähallitus, 2024

Trail info

Either direction on this short loop; pick up neighbouring segments clockwise or counter-clockwise depending on where you join the fortress ring.

Route direction

Open / Good Condition

Activities allowed

Run

Activity

Hike / Walk

Activity

Terrain & conditions

0.1 km

Distance

About 5–15 minutes for this loop and photos; longer if you link other Iso Linnamäki paths or walk up from Maari and the river.

Est. Time

Dirt

Surface

Loop

Route Type

Moderate Traffic

Traffic

Partial Shade

Shade

Location

60.39971°N, 25.65253°E

Approximate location

FinlandCountry

UusimaaRegion

PorvooCity

Hiking TrailsCategory

Explore nearby

Linnanmäen heittokenttä

249 m

Free

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Answers to your questions

Our data was researched from Porvoo, 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 Uusimaa Porvoo Hiking TrailsGreat Castle Hill trail 5