The Department’s Cartographica Laboratory and Library (CLL) is one of the most comprehensive of its kind in Hong Kong and nearby regions. It has a collection of almost 61,480 map items (with particular emphasis on Hong Kong and East & Southeast Asia); over 15,800 air photos (especially on Hong Kong); a size-able number of atlases, wall maps, marine charts, satellite images, and cartobibliographies.  The library also houses more than 1,500 geography dissertations and postgraduate theses, completed from 1968 onward.  It has three map browsing stations for HKU users to search for relevant Hong Kong maps in support of teaching and learning as well as research work.