It is located near the municipality of Nurmijärvi and its largest village, Klaukkala.

The most famous places in Lahnus are the Serena Waterpark[1] and Hotel Korpilampi.

[2] Finnish regional road 120 (Vihdintie) between Helsinki and Vihti, one of the most important road connections from Lahnus to the capital, passes through the district.

Lahnus is an old village name and has been spelled, among others: Lanoxby (1540), Lanos (1541), Lanas (1547), Lora (1558), Loureby (1559), Lahcnus (1563) and Lahnås (1594).

[6] The highest daily rainfall in Finland was measured in Lahnus: on July 21, 1944, it was 198 millimeters.