Main drainage basins of Finland
What is a main drainage basin?
There are 74 large river basins with a size of at least 200 square kilometers in Finland. They are numbered 1-74 beginning from drainage basins flowing into Lake Ladoga in the South East and continuing clockwise around the whole seashore ending in drainage basins flowing into the White Sea in the North East.
Small drainage basins that are located at the coast between larger river basins or at the country's borders are numbered 81-86.
Drainage basins of sea areas are numbered 91-99.
The main drainage basins are further divided into ... drainage basins