It is located at the border of Pirkanmaa, Päijänne Tavastia and Central Finland regions in the Finnish Lakeland.

Of these three both Lummene and Vesijako are bifurcation lakes and Vehkajärvi is situated between them so that waters from Lummene flow in two directions: eastwards into lake Päijänne and westwards into Vehkajärvi from which waters flow into lake Vesijako.

From lake Vesijako there are again two outflows: one eastwards into lake Päijänne, part of the Kymijoki basin that drains into the Gulf of Finland, and another outflow westwards into lake Kuohijärvi from which waters flow through a chain of lakes into Vanajavesi and finally into the Gulf of Bothnia through the Kokemäenjoki.

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