The Great Castle Hill lower rampart loop is about 0.4 km on our map: a short circular walk along the outer earthwork ring of Iso Linnamäki (Great Castle Hill), the forested fortress hill just north of Old Porvoo in Uusimaa. For archaeology, access, and how this hill sits inside Porvoo National Urban Park, the City of P...
Either direction works on the loop; many people link it with uphill sections or other Iso Linnamäki polku segments depending on where they started.
Route direction
Open / Good Condition
Open / Good Condition
Run
Activity
Hike / Walk
Activity
0.4 km
Distance
About 10–20 minutes at a relaxed pace for the 0.4 km loop alone; allow longer if you explore other Iso Linnamäki paths or the summit.
Est. Time
Dirt
Surface
Loop
Route Type
Light Traffic
Traffic
Partial Shade
Shade
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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.