According to Bichhiwara police, the couple hailing from the US, Yogesh Mujumdar and his wife Umaben were travelling in a SUV from Ahmedabad to Nathdwara where the temple is located.
Near Lehna gorge, the driver lost control over the vehicle on the multilane expressway.
Due to a steep turn on the highway, the SUV turned turtle and fell several feet down into the deep gorge leading to the death of the couple.
Both are undergoing treatment at Himmat Nagar and Dungarpur respectively.
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Meanwhile, bodies of the couple were sent for post mortem in Dungarpur district.
The couple had been living in the US for the past 12 years with their son. The family owns a grocery store in Arkansas state, police said.
"We have informed their family members in the USA. The couple was visiting their family members in Ahmedabad," said Indrajeet Parmar, a sub-inspector posted at Bichhiwara police station.