[OSM-newbies] Weird square on the map

[Donald Campbell II]

I sometimes like to trace rivers from the landsat wms images in Guyana.
 They're not very good quality but it works.  Now Mapnik doesn't render
waterway=river at low zoom levels so I switch to Osmarender to survey larger
areas and see where there's not many rivers traced yet.  I've done this a
bit and was wondering how Guyana was starting to compare to nearby countries
and how much river density there is in OSM.

So I zoom out a bit and look around to find this neat little
area<http://www.openstreetmap.org/?lat=-10.21&lon=-57.34&zoom=7&layers=O>
.

At first I was zoomed out further and it looked like a blue square of random
static but on checking it with the WMS there are indeed little rivers and
streams in those areas.  It's an IBGE import (
http://en.wikipedia.org/wiki/Brazilian_Institute_of_Geography_and_Statistics)
of that area and the waterways do agree very roughly so it is useful as a
first draft.  Keep that up and Brazil will turn completely blue!  :-)

Just a random thing I thought newbies would find interesting.

The Big Blue Box in Brazil!
-Don.
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