Here’s a Google Map of red shirt protest sites. The map (embedded below) also includes the locations of various clashes and blasts that have occurred here in Bangkok over the past weeks.
I can’t vouch for the accuracy of the points or the descriptions of the various incidents, but the map is helpful in gauging the scale of the space red shirts have occupied.
View Bangkok Dangerous – Red Shirts Rally March-April 2010 in a larger map
Source: Richard Barrow.