The M41, the mythical Pamir Highway, is one of the highest international roads on Earth — its Ak-Baital pass tops out at 4,655 m.
About 93% of Tajikistan is covered in mountains — Ismoil Somoni Peak grazes 7,500 m.
The Pamir region requires a GBAO permit on top of your stay. An eSIM helps: checkpoints and permits in order, offline maps (coverage is scarce) and fuel stops between Khorog and Murghab.