The map can be zoomed from the left-hand side buttons on the map, or by pressing the ctrl key and scrolling with the scroll wheel. It is also possible to move around the map by left-clicking on the map and dragging the mouse pointer. Additional information can be found by clicking on the map. The map type can be changed from the menu on the upper right-hand corner of the map.
NB! The maps are approximate. More accurate information about the fisheries and their borders can be aquired from fishing licence vendors.
From the link below, a summary in Finnish about fishing in the waters of Iijoki can be downloaded.