The Lake Päijänne basin starts from Lake Vesijärvi in Lahti and continues north as far as the city of Jyväskylä. Altogether the lake covers an area of 1 118 km2
. The largest open bodies of water in the lake are “Asikkalanselkä”, “Tehinselkä” and “Judinsalonselkä” in the southern part and “Vanhanselkä” and “Ristinselkä” in the northern part. The largest islands in the southern part are Virmailansaari (situated in Padasjoki) and Salonsaari (situated in Asikkala). You get to Lake Päijänne from Lake Vesijärvi via Vääksy Canal
and from Lake Päijänne to Lake Ruotsalainen via Kalkkinen Canal.