Grammatiko is situated in the hills of the northeastern part of the Attica peninsula , 6 km from the South Euboean Gulf coast , at about 210 m elevation . It is 4 km southeast of Varnavas , 5 km north of Marathon and 32 km northeast of Athens city centre . The municipal unit Grammatiko consists of the villages Grammatiko , Agia Marina and Sesi . It has an area of 51.674 km2 . Helios Airways Flight 522 crashed in the hills near Grammatiko on 14 of August 2005 after a lack of cabin pressure incapacitated the aircraft 's crew members
Helios Airways Flight 522
Helios Airways Flight 522
Grammatiko