The Pirttilampi lean-to (Kenttä lean-to) is 51.5 km north-west of Rovaniemi on the northern side of Marrasjärvi, or Marras Lake on the shore of the small pond Pirttilampi in a beautiful area by the mouth of the Kenttäjoki, or the Kenttä River. The lean-to features a campfire, woodshed, outhouse and waste bin.