The lower of the two sites called al-Huwaysilat sits on the same bank of the Tigris as the upper one, and in practice they run into each other, which is what happens when a caliph's city stretches for thirty kilometres. Samarra's name was said to come from a phrase meaning that he who sees it is delighted, though the Arabs also joked that it was a place where a man who saw it was grieved, and the court's brief life there suggests that both were true.
What the Abbasids understood best was water. The river was the lifeblood of the capital, and they dug long canals to bring it to gardens, palaces and fields. The land is flat, silty and pale, and in the green belt beside the river grow date palms, pomegranates and vegetables, while the dry plain beyond stretches out to a sky that fills most of the view. At sunrise, the light on the ruined walls is warm and soft, and the shadows are long.
Practicalities matter more than usual here. Highway 1 follows the river, and the road is a fast one, with drivers who treat the white line as a suggestion. Spring is pleasant, with green fields and wildflowers, but summer is fierce, with temperatures that can rise above 48 degrees, so it is wise to ride early and rest in the shade at midday. Winter nights can be cold. Before planning a visit, read the latest travel advice, because the security situation in Salah ad-Din province has varied.
Carry spare water, a basic toolkit and a charged phone, as help may be some distance away. Locals are usually friendly and curious, and a rider who stops to look at the ruins is likely to be offered tea. Ask permission before photographing people or military installations, and remember that the golden-domed shrine in the city is a living place of worship.