Libertyville Township covers an area of ; of this, or 2.43 percent is water. Lakes in this township include Big Bear Lake, Harvey Lake, Liberty Lake, Little Bear Lake, Minear Lake and West Lake. The stream of Bull Creek runs through this township.
In 1985, Libertyville Township established the first Township Open Space District in Illinois. This innovative land protection program was funded by a 22.6 million-dollar bond referendum approved by the residents of Libertyville Township. The Open Space Bond was retired fully paid in October, 2003. Since land acquisition began in 1986, over of irreplaceable open space have been protected with these funds. Two of these sites, Oak Openings and Liberty Prairie have also received the state’s highest protection status as Illinois Nature Preserves.