Aroyo - also known as Areya - sits in Dinka country in the far northwest of South Sudan. The Chel River runs past the town's eastern edge; Marial Bai lies to the north. A small airport once served the area, just north of the town proper. Roads in this part of South Sudan are ambitious on paper and intermittent in practice. In January 2012, local authorities announced the completion of 64 kilometres of road between Aweil to the east and Aroyo - a project that had taken from February to December 2011. By August 2016, much of that road had been washed away by the rains. Another road led south toward the B41 highway, which connected Wau with Deim Zubeir. The road is a thin line on the maps. The reality depends on the season.

On 10 July 2014, a group of soldiers who had deserted their units laid siege to the compound of the African Kongdai construction company between Aroyo and Awoda. They looted food and medicine from the clinics. The communities around them fled to take refuge near government buildings, not because those buildings offered any real protection, but because they were known. The deserters loaded stolen household items into a stolen vehicle and drove away. 270 displaced households made temporary settlements on land provided by the local government in Aroyo centre. Most of them could not return home - the flooding had made the journey impossible, and rumours circulated that other armed groups were approaching. They planned to stay until the end of the rainy season in November or December. Their shelters were grass, topped where possible with plastic sheets they largely did not have. Concerns were malaria, diarrhoea, and staff who never came.

In January 2017, Aroyo County received a three-month supply of medicines from the health ministry in Juba. The supply was newsworthy because it was rare. River blindness remained endemic in the county - a disease caused by a parasitic worm transmitted by black flies breeding along the Chel and other rivers, one that blinds those it infects through years of inflammation in the eye. State authorities had not controlled it. Nor had the international non-governmental organisations. The disease retreated elsewhere in Africa when community-based ivermectin distribution reached rural populations. Aroyo County was not reached. The drugs sat in Juba, in Geneva, in donor capitals, while along the Chel people quietly lost their vision.

The 2015 decree that made Aroyo a county headquarters was part of President Salva Kiir Mayardit's larger rearrangement of South Sudan's internal borders. Old states were subdivided; new ones appeared. Aweil State, of which Aroyo briefly became a county capital, existed from 2015 to 2020 before being abolished again in another reorganisation. The administrative geography shifted, but the actual infrastructure of government - offices, vehicles, budgets, trained staff - did not follow. A commissioner with no vehicle is an allegory for the whole arrangement. The Dinka people of the Chel continued to farm, fish, and herd as they always had, largely uninterested in the paper borders and extremely interested in when the rains would arrive.

Aroyo sits near the core of the old Bahr el Ghazal region, a land of swamps and ironstone plateaus in northwestern South Sudan that has been Dinka country for centuries. The name Bahr el Ghazal translates from Arabic as sea of gazelles. Elevation in the area hovers around 440 metres. The rivers here - the Chel, the Lol, the Pongo - all eventually feed the Bahr el Ghazal itself, which joins the White Nile in the Sudd. From altitude, the region in the dry season looks like savanna stippled with the dark green serpents of gallery forest along the rivers. In the wet season, parts of it look like a shallow silver sea.