Unfortunately, currently there is no easy way to limit region displayed on the map.
In theory, it is posible to display a section map only using a custom tile provider, because you can return "null" from the GetTile method for regions your source doesn't cover.
But this process has an important restriction - the tiles you provide should cover a part of map that is a part of the world's map grid. For example first zoom level contains four tiles. Second divides each quadrant to four parts, etc. So, the source you use should cover a region according to this grid.
Also you should calculate the geographic location of each tile in the GetTile method in order to determine the correct tile to return.
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