Those ligthouses seem to be edited by the openseamap editor. That project puts lots of machine readable metadata on the nodes to create really useful sea maps.

Maşallah, this is one fricking big and difficult lake to draw. And I tought my lake Edirne was complicated (Coordinates: 38.05 / 31.84 at http://informationfreeway.org/?lat=38.05&lon=30.84&zoom=10&layers=B0000F000F ) :-)