Flying or worming between even those two extremely close sietches in the north probably take about 150 game frames to arrive at the destination. You can only what, what, 20 frames, before you pass out? You know the sietches I mean... where moving troops between them is instant... I think they're up in the Bleden region, or thereabouts. Besides, you can only face one direction - North I assume - and there is no way to know if you're going the right way or are aligned with the destination. I'm sure I've walked in to vegetation based from another sietch but that's as far as it can go, I'm sure.