The Northern Front was an important defensive area north of Boden, where Pagla Ski Stadium is located today. The area included many facilities and shooting ranges, protected by three rows of tank barriers designed to stop advancing enemies. Old maps show that structures covered almost the entire area. Key parts of the Northern Front included Degerbergsfortet, the Leåker Battery, Facility 8, The Radio Bunker and The Balloon Hall.

Degerbergsfortet was built between 1900 and 1908, located north of Boden and west of lake Buddbyträsket. The fort was surrounded by a blasted moat and could accommodate over 500 men. It was self-sufficient with its own electricity and water supply, including a power plant and a deep well. Part of Sweden’s gold reserve was stored here until 1982. The fort was decommissioned in 1992.

Armament and defenses:

• 12 cm, 8 cm, and 6 cm cannons.

• Observation post, two infantry redoubts, and two searchlight positions.

The Leåker Battery, built between 1900 and 1908, is located north of Boden, west of Degerberget Mountain. It is an intermediate defensive structure with a core resembling a small fort, surrounded by a moat on the southern side. The battery was protected by storm barriers, rifle trenches, and three rows of granite and concrete tank obstacles.

Inside, there were tunnels and three shelters, one of which could accommodate 24 people. Southeast of the battery was a mountain barracks housing 229 soldiers from the fortress rifle company, responsible for defense and close protection.

Armament and defenses:

• 10 x 8 cm cannons covering lake Vittjärvsträsket and surrounding areas.

• Flanking batteries and a searchlight track east of the battery.

• Separate infantry quarters in the mountain barracks.

The Western Front is the most active area today. Here, you’ll find a shooting range, Rödbergsfortet, and Slumberget. The shooting range is classified as a restricted area, and access is prohibited during exercises. Rödbergsfortet offers guided tours, and in many places, you can still see remnants from the time when the close defense system was extensive.

On the Western Front, you’ll find Rödbergsfortet, which was built between 1903 and 1908, located south of Boden on the western side of the Lule River. The core structure is surrounded by a blasted moat, with steep cliffs providing natural protection against advancing enemies. During its active years, the fort was modernized with backup power, heating, and improved hygiene facilities.

Armament and defenses:

• Original armament: 15 cm, 8 cm, and 6 cm cannons.

• Modernization (1970s): 15 cm howitzers replaced with 12 cm cannons; an additional "Satellite" with two 12 cm cannons was built.

• Defensive features: Two observation posts, four infantry redoubts, and two searchlight positions.

The Eastern Front is home to two large forts: Mjösjöfortet and Gammelängsfortet. Around these forts, several close-defense positions were built, designed to confront potential attackers. The area also had anti-aircraft positions that provided additional support. Near lake Svartbyträsket is the Svedjeberg Battery, which reinforced the defense of the larger forts.

Mjösjöfortet was built between 1900 and 1908, located north of Gammelängsberget Mountain, east of Boden. The fort was surrounded by a blasted moat and included barracks, mess halls, a power plant, a deep well, and medical facilities for over 500 personnel. It was decommissioned in 1978.

Armament and defenses:

• Four 15 cm howitzers, three 8 cm cannons, and eight 6 cm cannons.

• One infantry redoubt and two searchlight positions (east and west of the fort).

Gammelängsfortet was built between 1900 and 1908, located east of Boden. It was surrounded by a blasted moat and designed to withstand long sieges. The fort featured barracks, mess halls, a power plant, a deep well, and medical facilities, accommodating over 500 personnel. It was decommissioned in 1992.

Armament and defenses:

• 12 cm, 8 cm, and 6 cm cannons.

• Observation posts, infantry redoubts, and two searchlight positions.

The Southern Front is smaller than its northern counterpart and has fewer large structures. However, tank barriers are also present here as part of the defense. This front included Södra Åbergsfortet and the Norra Åbergsfästet Battery.

Södra Åbergsfortet was built between 1902 and 1908 on the eastern side of the Lule River. It was modernized in the 1960s and reinforced in the 1970s to withstand nuclear attacks. The fort is surrounded by a moat and protected by cliffs facing Rödberget and the village of Svartbyn. Despite the reinforcements, its roof was weaker than those of other forts in Boden.

Armament and defenses:

• Cannons: 12 cm, 8 cm, and 6 cm.

• Defensive features: 2 observation posts, 4 infantry redoubts, and 2 searchlight tracks (north and south of the fort).

Norra Åbergsfästet was built in 1910 and manned by around 100 soldiers to defend Åberget against eastern enemies. It was decommissioned in 1943. The site featured a 10-meter-deep moat, tunnels for storage and shelters, but no heating. Its armament included four 8 cm cannons and a spotlight to illuminate the field