Fog of War

The Fog of War is the effect that takes place on areas of the map that are not within the vision range of your allies. You can only see enemy units if they are in range of an allied unit. This means that, while you can see the topography of any area on the map, you can't see enemy units that are in the Fog of War.

The places which don't lie in the Fog of War are colored a lot brighter on the map, so it's easy to see where the Fog is located.

If you don't have an Oracle's Elixir and aren't near a Vision Ward, stealthed units can't be seen even if they leave the Fog of War.

Ways to reveal areas in the Fog of War
There are several ways to reveal an area in the Fog of War:
 * An allied unit moves close to it, so that the area is in his range.
 * If a is placed near to it, the area is revealed for 4.5 minutes.
 * If a is placed near to it, the area is revealed for 3.5 minutes (including stealthed units).
 * The Summoner Spell reveals a small area anywhere on the map for 6 seconds.
 * is specifically designed to reveal the fog of war.
 * is designed to reveal all enemy champions (and a very limited space surrounding them) even if they are hidden by the fog of war.
 * will reveal nearby enemy champions (and a very limited space surrounding them) who are at low health even if they are hidden by the fog of war.
 * reveals a small area around where it is placed until set off.
 * Several champion abilities provide temporary vision to a small area on impact or to a target hit by them such as,  , and.
 * ,, and   grant temporary vision where they are placed.
 * temporarily grants vision while on it's flight path.