The Gói-tói Holt-Tisza (Gói-tó oxbow lake) is close to the village of Kőtelek. It is under protection and it is listed among the so-called "sanctuaries". Researchers and conservationists categorised the most pristine oxbow lakes of the Tisza and tributaries as "sanctuaries". Oxbows of this type are dedicated solely to conservation, no fishing or recreational activities can be permitted.
Gói-tó was formed in 1865 when a huge river bend was cut off. It sustains a rich and diverse flora and fauna. The area between the oxbow and the river has been used for forestry and field crops, but some of the arable land has been gradually abandoned. As a result, a significant portion of the area is now occupied by invasive weeds such as the bastard indigo, Canada goldenrod (Solidago canadensis) and the spiny clotbur (Xanthium spinosum). It is a promising sign that the black and white poplars that reach above the dense thicket of the bastard indigo are developing well. Based on the experience from other areas it is expected that the indigo will recede under the permanent shade of the poplars, and the thicket will open up. In the long term it is expected to develop into a forest. Due to the fact that large contiguous areas of forest have a high conservation value the goal of the programme is to help facilitate the succesional process.
The area is privately owned, and is not under protection. The abandonment of the fields over the past ten years is an indication that the cultivation of the are is not profitable for the owners. Hortobágy National Park is planning to purchase the area and to bring it under protection. WWF Hungary will assist the National Park in these efforts.