Alle is first mentioned in 1136 as Alla. The municipality was formerly known by its German name Hall, however, that name is no longer used.
Alle has an area of 10.6km2 (4.09sqmi). Of this area, 6.81km2 (2.63sqmi) or 64.2% is used for agricultural purposes, while 2.36km2 (0.91sqmi) or 22.3% is forested. Of the rest of the land, 1.37km2 (0.53sqmi) or 12.9% is settled (buildings or roads), 0.08km2 (20 acres) or 0.8% is either rivers or lakes and 0.01km2 (2.5 acres) or 0.1% is unproductive land.
Of the built up area, industrial buildings made up 1.1% of the total area while housing and buildings made up 6.8% and transportation infrastructure made up 4.3%. Out of the forested land, 21.0% of the total land area is heavily forested and 1.2% is covered with orchards or small clusters of trees. Of the agricultural land, 50.0% is used for growing crops and 13.6% is pastures. All the water in the municipality is flowing water.
This is the only Atlantic auk of its size, half the size of the Atlantic puffin at 19–21cm in length, with a 34–38cm wingspan. Adult birds are black on the head, neck, back and wings, with white underparts. The bill is very short and stubby. They have a small rounded black tail. The lower face and fore neck become white in winter.
The flight is direct, with fast whirring wing beats due to the short wings. These birds forage for food like other auks by swimming underwater. They mainly eat crustaceans, especially copepods, but also other small invertebrates along with small fish. They collect in large swarms before leaving their breeding rocks to head out to sea for food as well as when they return.