Animal social networks describe the relationships that connect interacting individuals. While understudied in reptiles, a close examination of lizard society can reveal a remarkably complex social network. We compared variation in the interactions between Microlophus atacamensis on rock outcrops to interactions among the same individuals in the adjacent boulder field, using data from each habitat separately as well as using all the interactions to describe their social network. We tested the hypothesis that boulder fields serve as display arenas to both cement and expand social relationships. M. atacamensis is a species of lizard endemic to the rocky coasts of the Atacama Desert, Chile. To examine their social network, we recorded every interaction that occurred during a 30 to 120-minute survey period from fixed locations that allowed 3 – 5 observers to view the entire boulder field. Simultaneously, one observer surveyed the rock outcrops that bordered the boulder field to determine occupancy and to record any interactions that occurred on the rocks during the same survey. We classified five interaction types: chases, displacements, fights, retreats, and associations. We examined network indices of centrality by sex and body size including degree and betweenness, as well as measures of association tendencies such as homophily and assortivity. Our data indicate that the social network of M. atacamensis closely resembles that of a harem, with one or two males occupying a rock outcrop along with several females. Rock outcrops appear to serve as territorial sites whereas boulder fields act as display venues into which individuals descend to interact with one another.