Lännafortet, Defensive fortification in Skogås, Huddinge, Sweden

Lännafortet is a fortification on the rocky slope above Gamla Nynäsvägen in southwestern Skogås, Huddinge Municipality. Built in 1908–1909, it consists of trenches, artillery batteries and rifle emplacements. The long, narrow layout, likened to a sausage, gave the defensive line its nickname Korvlinjen. Today parts of the rifle emplacement serve as retaining walls for high-rise buildings.

Lännafortet was built in 1908–1909 as part of the Södra Fronten, the southern line of Stockholm's fixed defences known as Korvlinjen. It was financed by private donors through Föreningen för Stockholms fasta försvar and the Palmqvistska fonden, built by military labour under civilian direction, and remained in the defence organisation until 1952.

The nickname Korvlinjen, the Sausage Line, comes from the long, narrow shape of works like Lännafortet stretching through the landscape. The line was paid for by private donors through the Föreningen för Stockholms fasta försvar and the Palmqvistska fonden, then handed to the military. Today parts of the rifle emplacement serve as retaining walls for the high-rise blocks of southwestern Skogås.

The site is accessible via Stockholm's public transportation, and walking paths connect the main points of interest. The best time to visit is spring through autumn, when the ground is dry and pathways are easiest to navigate.

The fort preserves visible traces of gun batteries and earthen ramparts that show how soldiers once defended their positions. The remains give a direct look at how weapons and defensive walls were arranged on the ground.