The Tangra 2004/05 team covered either on ski or on foot an overall distance of some 200 km , mostly in harsh weather conditions and challenging unfamiliar terrain in eastern Livingston Island , including the first crossing of Bowles Ridge , and first visit and routes to Vidin Heights , Gleaner Heights , Melnik Ridge , Levski Ridge , Saedinenie Snowfield , Kaliakra Glacier , Struma Glacier , middle Huron Glacier , Leslie Gap , Elhovo Gap , Gurev Gap , Yankov Gap , Pirdop Gate , Lozen Saddle , and the peaks Lyaskovets , Zograf , Lozen Nunatak , Erma Knoll , Aheloy Nunatak , Ravda , Komini , Ongal , Melnik , Castra Martis Hill , Radnevo , Zemen Knoll , and Miziya , as well as the third ascent of Presian Ridge and the island 's summit Mount Friesland ( 1700 m ) .