Here May Be Dragons

Exploring unmapped territory, your task is to lift the fog of the land and search for deep forests and high mountains. But beware - landscapes that draw you in might already have awakened the interest of other, less friendly parties roaming the land.

As it says on the blank parts of the map:
Here May Be Dragons

You place tetris-tiles on the map to reveal it.

Tiles can only be placed adjacant to the last placed tile.