The entries shown on the map are places recorded in the Genuki gazetteer. The location of many small places can be found by following the Place search link above.
The shape of the icons indicates the precision of the gazetteer entries. A teardrop is used for exact locations, with a square icon used for approximate locations. A grey icon appears for those entries that have not yet been associated with a place node, and for the rest, those entries linked to the same place page have a common colour. We do have just twelve colours so there will be inevitable re-use of a colour.
The icon in the top right hand corner of the map lets you change the source of the base map.