The left map has a list of zoom locations below it. It is defined as [map controls="default" zoomlist="left={-180,-90,0,90,Left hemisphere},right={0,-90,180,90,Right hemisphere},countries={geodata|select box2d(geom) as extent,name as label from worldcountries|Countries}" width="256" height="256" maxextent="-180,-90,180,90" extent="-180,-90,0,90" baselayers="google" class="align-left"/]

The zoom list can contain fixed locations or it can use a query that returns a bounding box of a geometry and a label. A fixed location can optionally be followed by a label.
A query is optionally preceded by a database name; otherwise the default geodata database is used. The query can also be followed by an option group title.