Hmmm. Define "direct area"

. I don't remember offhand the exact formulas for how far the points radiate Quality -- it involves a fair amount of random -- but basically they have an epicenter of max quality, from which Q radiates out. If you get water from say a river tile -- where a Q point has effect, obviously -- and then follow that river a few tiles, you should get the hang of it. Q decreases by a few points every other or third or fifth tile or so. If it's water you're after I'd probably suggest looking elsewhere. Note, though, that nothing prevents two Q points from affecting the same area, in which case the strongest/closest one will be used (IIRC).