Lake Ohrid, straddles the mountainous border between southwestern Macedonia and eastern Albania. It is one of Europe's deepest and oldest lakes, preserving a unique aquatic ecosystem that is of worldwide importance, with more than 200 endemic species. The importance of the lake was further emphasized when it was declared a World Heritage Site by UNESCO in 1979 and when, in 2010, NASA decided to name one of Titan's lakes after Lake Ohrid. In 2014, the Ohrid-Prespa Transboundary Reserve between Albania and Macedonia was added to UNESCO's World Network of Biosphere Reserves. The towns situated at the lakeside are Pogradec in Albania, along with Ohrid and Struga in Macedonia. The lake is otherwise densely surrounded by settlements in the form of villages and resorts in both basin countries.