The lake, which is filling a geological fault, has steep cliffs along the western shore. To the north it connects to Vårbyfjärden through the narrow strait Fittja näset. Its is an important recreational area for inhabitants in the neighbouring suburbs Alby, Vårby gård, and Myrstuguberget, as well as for a large number of other visitors attracted by the Flottsbro Open-air Area and its bath in the southern end of the lake.
On the shores are plants like Alders, Hybrid Crack Willows, Osiers, Elms, Ashes, Grey Willow, Birch, Aspens, Great Yellow-cress, Gypsywort, Skullcap, Whorled Mint (a hybrid species between Corn Mint and Water Mint), Trifid Bur-marigold, Slender Tufted-Sedge, Reed Sweet-grass, Annual Meadow-grass, Silverweed, Purple-loosestrife.
Naturally occurring fishes are Melt, Northern pike, Roach, Rudd, Tench, Bleak, Silver Bream, Carp Bream, Eel, Burbot, Perch, Zander, and Ruffe. Spined loach was discovered in 2002 and occasionally Salmon and Brown trout find their way into the lake, the later introduced in a local brook in 1992-93.
The invasive bivalve Zebra mussel was first documented in Lake Mälaren in the 1920s and was confirmed in Albysjön in 2002. Other molluscs include Painter's mussel, Duck mussel, River nerite, and River snail. Crayfishes are not documented in the lake but as Signal crayfish is present throughout Lake Mälaren it is believed to be present in Albysjön as well.
Commons birds include Canada Goose, Mute Swan, Mallard, Great Crested Grebe, Coot, Goldeneye, Gull, Herring Gull, Black-headed Gull, and Reed Bunting. In summers common visitors include Osprey, Grey Heron, Great Cormorant.