Grade 4 : Strenuous

Elevation: Above 5,500 meters (16,404 feet). Trail Description: Snow-covered passes and remote, challenging trails. Duration: Long treks with full days of trekking in rugged terrain. Fitness Requirement: Requires excellent stamina and mental preparedness. Acclimatization: Extensive acclimatization is necessary. Examples:Everest Base Camp Trek via Gokyo Lakes, Kanchenjunga Circuit Trek, Rolwaling Valley Trek, etc.