The full list can be found at Category:Wikipedia requested photographs in Guyana. These articles would all benefit hugely from the addition of a photograph, so any contribution to knocking one or more of these off the list would be greatly appreciated! To find out more about creating and uploading photographs for Wikipedia, see WP:Images.
By adding coordinates, a Wikipedia reader can easily view the location on a street map, nautical chart, topographic map, by satellite photo, realtime weather map, and in many other ways. Coordinate data makes an article eventually appear in various services such as Google Maps' Wikipedia overlay, Google Earth, and Wikipedia's own internal map service. Coordinate data also helps readers looking for geographically-based data, such as locations near a reference point, or related information.
How is it done?
The articles are all marked with {{coord missing}} tags, which need to be replaced with {{coord}} tags that contain the location's latitude/longitude coordinates; or you might be able to add coordinates to an existing infobox. You can find out how to do this at the Wikipedia:Geocoding how-to for WikiProject members. Anyone making coordinate corrections should read Template:Coord/doc first. Some articles that do not display the coordinates in the upper right corner of the article have "display-title" missing from the Coord template.