The northern edge of the Al-Ahsa oasis is where the groves thin out and you can see the join between farmland and desert. Al Qurayn, a town of about 12,000 people, lies right next to this point, with Julayjilah and Al Mutayrifi close behind, and the whole cluster is one continuous patchwork of date gardens, walls, irrigation channels and low flat-roofed houses. The label talks about a northern oasis, and from the ground the point is simply that the green does not stop abruptly: it frays into scrub, then dunes.
Two sights are tied into this stretch. Qasr Khuzam is a fortress-like palace in Hofuf, the oasis's main town, long associated with the rulers and governors of the province, and it is one of the more recognisable historic buildings in the region. Al-Oyun, the village whose name means the springs, belongs to the same landscape and recalls the abundance of water that made the oasis. Locals have used these springs for as long as anyone can say, and some of them are now lined and used for swimming and farming.
The riding is flat, hot and straightforward. Roads between the farms are narrow, with speed bumps near villages and the odd tractor or truck loaded with dates, and the main arteries are wide and fast. The best light is early in the morning, when the palms look dark green and the air still smells of damp soil. Summer afternoons are extreme, with temperatures that can top 45 degrees, so plan your stops around shade and carry water, not just for you but for the bike's cooling system if you are idling in traffic.
Fuel and food are easy to find, with stations on the main roads and plenty of shops and cafés in Al Qurayn and Hofuf. The old covered markets of Hofuf, with their rows of stalls selling spices, dates, brass and bisht cloaks, are the best place to browse if you have time to stop. Keep to conservative dress in town, ask permission before taking photographs of people, and remember that Friday midday is prayer time, when many shops close. The oasis is also known for its traditional pottery and weaving, and rice and lamb dishes are the usual fare at a sit-down meal.