The Suheli River forms the southern boundary of the Dudhwa National Park and is considered the park's "life line".Singh, B. (2009). Effect of water pollution on Pistia stratiotes in river Suheli of Dudhwa National Park and river Gomti of Lucknow city. Research in Environment and Life Sciences 2(3): 173–178. It is a major river of the park, which is considered one of the last areas of productive Terai ecosystems in India.Kumar, S. (2009). "Retrieval of forest parameters from Envisat ASAR data for biomass inventory in Dudhwa National Park, U.P., India" Thesis submitted to Indian Institute of Remote Sensing and International Institute for Geo-information Science and Earth Observation.
The Suheli, along with the Sharda and Mohana, drains into the Ghagra River system.Tiwaru, P. C., Joshi, B. (1998). Wildlife in the Himalayan Foothills: Conservation and Management Indus Publishing, New Delhi.
South Asian river dolphins possibly occur near the confluence of the Suheli with the Ghagha (Ghaghara), but there have been no surveys to confirm this.Reeves, R. R., Smith, B. D., Kasuya, T. (2000).Biology and Conservation of Freshwater Cetaceans in Asia. Issue 23 of IUCN Species Survival Commission Occasional Paper Series
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