Elevation: Above 5,000 meters (16,404 feet). Trail Description: Includes high passes, rocky terrain, and possibly snow-covered paths with glacier crossings. Duration: Extended treks with days requiring over 6 hours of trekking. Fitness Requirement: Demands strong physical fitness and endurance. Acclimatization: Essential due to high altitudes. Examples:Annapurna Circuit Trek,Upper Dolpo Trek,Nar Phu Valley Trek, etc.