Determine if the sentence is true based on the text below:
Adelaide is on a river.

SYDNEY, Oct 5 (Reuters) - An Australian couple got a fright when they were swallowed by a three-meter (10-foot) sinkhole as they sat in their car enjoying the Adelaide views. The couple, who suffered minor bruising, climbed out of the sunken vehicle on Tuesday and found refuge with a resident in the suburb of Glen Osmond. "They were quite shocked, so we gave them a cup of tea and you know, sort of settled them down," Dewald Behrens told the Seven Network. The sinkhole opened above an old lead and silver mine shaft, media said.