The layout of landing pages is determined by the cms_landing_page.tpl file in the CMSadapter@x.x.x module. In the following screen shot you see the defined areas. Note that you also see the header, footer, and breadcrumb areas that are defined in those modules.
The cms_landing_page.tpl file contains one Page Type area and one This Page area.
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Page Type — cms-landing-page-placeholder-page-type
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This Page — cms-landing-page-placeholder-path