The main tourist attractions near Reykjavík have been explained here. This map shows the location slightly more accurately:
Þingvellir on the NS-axis of the south polygon of West Volcanic Zone, Reykholt on the upwelling line extending from Reykjanes Ridge, Deildartunga on the EW-axis extending from the mini-polygon of Reykholtsdalur, Hraunfossar on the other up-welling line from RR, close to the east corner of the mini-polygon, Hveragerði on the main crossings of lines, Laugarvatn found on two down-welling upper lines, also above the main division line of lower mantle, Geysir on the down-welling line extending to the NW from Hekla, slightly offset from the main division line of lower mantel, Gullfoss found at the upper part of a gorge, which extends to the lowlands, actually marked by the down-welling division lines of Hekla-Geysir-Reykholtsdalur.
By zooming in on the places and studying the geological framework, the consistency between convection rolls division lines and the tourist attractions becomes clearer.
Magic Magma 