For the first time in history, citizens from Ecuador will be asked this weekend to decide on the future of oil extraction in the Amazon.

The referendum on Sunday will ask voters whether they want oil drilling to continue in Yasuni National Park, hailed as one of the world’s greatest havens of biodiversity. The largest protected area in Ecuador, the park contains massive oil reserves that cross Indigenous land.

“We now have the power to let go of the oil companies and give victory to land, water and life,” Nemonte Nenquimo, an Indigenous leader of the Waorani people, told Al Jazeera. “[The referendum will be] a day we will remember as the day the planet started to win, and corrupt politicians and oil companies lost.”

The Ishpingo-Tambococha-Tiputini (ITT) oil field spans nearly 2,000 hectares (4,942 acres), part of which crosses onto Yasuni land, home to the Tagaeri and Taromenane people, who live in voluntary isolation.