Pääjärvi (Lammi)

Pääjärvi is a medium-sized lake in Finland. It is situated on the border between the city of Hämeenlinna in the Tavastia Proper region and the municipality of Hollola in the Päijänne Tavastia region.[1]

Pääjärvi
Pääjärvi
Location	Hämeenlinna, Hollola
Coordinates	61.06°N 25.13°E / 61.06; 25.13
Lake type	Natural
Primary inflows	Putulanjoki river
Primary outflows	Teuronjoki river
Catchment area	Kokemäenjoki
Basin countries	Finland
Surface area	13.444 km2 (5.191 sq mi)
Average depth	14.83 m (48.7 ft)
Max. depth	85 m (279 ft)
Water volume	0.199 km3 (0.048 cu mi)
Shore length1	36.59 km (22.74 mi)
Surface elevation	102.9 m (338 ft)
Frozen	December–April
Islands	Etolansaaret, Lamminsaari, Kalliosaari
References	[1]
1 Shore length is not a well-defined measure.

The lake drains through the Teuronjoki river into the lake Mommilanjärvi and from there through the Puujoki River into Lake Kernaalanjärvi and from there through the Hiidenjoki River into Lake Vanajavesi and it is thus a part of the Kokemäenjoki basin that drains the western third of the Finnish Lakeland.