The Blank Lands

Terrain and People
Literally, a blank spot on all maps extending about 2k km north-south and 3k km east-west. Travel there, except upon the Great Sakbe, is fatal as far as is known. Travellers on the Great Sakbe are prevented from viewing the Blank by huge bamboo screens on the outer sides of the roads, or, in some places, by raised walls. No further information is available.

Risks (To Combine)
No known risks except an attempt to transit them off the Great Sakbe Road. Whatever keeps parties from entering may or may not be hostile outside the Blank Lands, but no record of excursions by that force exists.

Military
No known capability, but some obviously does exist.

Economics
No known items of economic value and no trade.

Politics
No known political entities.

Additional Information

 * Is this caused by voyd of some sort?