Band-e Amir is a chain of six deep-blue lakes held back not by concrete but by walls the water built itself. Over hundreds of thousands of years, mineral-rich springs seeped from faults in the rock and left calcium carbonate behind, until the deposits grew into natural travertine dams that step down the valley and pond the water behind them — one of only a handful of travertine lake systems on Earth. The lakes lie at around 2,900 metres on a high plateau in Bamyan, and the largest, Band-e Haibat, reaches an average depth of about 150 metres. Because the dams are pale travertine and the water carries dissolved minerals, the lakes glow sapphire and turquoise, a colour made stranger by the parched crimson cliffs that ring them; in places the water brims over a dam and slips down in thin falls. In 2009 they became Afghanistan's first national park.
You can walk the tops of the travertine walls, some no wider than a footpath, with lake on one side and a long drop on the other, and dip a hand into water that stays icy even in July, fed by snowmelt at this altitude. In summer, painted paddle boats drift across Band-e Haibat, and at night, far from any city, the stars sit thick over the plateau. The lakes are sacred to the Hazara, who have come here on pilgrimage for generations; a shrine to Hazrat Ali stands on the shore, and by local belief Ali carved the dams by a miracle — one lake named for his sword, another said to be a wall of cheese. Reaching the park is still possible, but its recent story is harder: in August 2023 the Taliban barred women from entering, reversing years in which local women had worked here as rangers, so anyone planning a trip should check the security situation first.