The oasis that surrounds Jabrin is the reason the settlement exists at all. In a region where water is scarce and agriculture impossible without irrigation, the falaj channels that bring water from sources in the Hajar mountains have sustained this community for centuries. The result is a lush belt of date palm gardens, small vegetable plots, and fruit trees that stands in sharp contrast to the bare gravel plains stretching away in every direction.
The falaj system at Jabrin is part of the larger network of five Oman aflaj inscribed on the UNESCO World Heritage List in 2006. Visitors can see sections of the open channels running through the palm groves, particularly on the approach to the fort from the road. The date harvest in late summer (August to September) is the best time to see the falaj in full use, with water diverted systematically between garden plots according to an allocation system unchanged for generations.