Actor and self-proclaimed environmentalist Pierce Brosnan apologized for trespassing on hot springs in Yellowstone National Park by paying a fine.

Brosnan, 70, visited the Mammoth Hot Springs on Nov. 1 and pleaded guilty to crossing into an off-limits area, according to the U.S. attorney’s office for Wyoming. As a result, the actor paid a $500 fine and an additional $1,000 to the Yellowstone Forever Geological Fund.

“As an environmentalist I have the utmost respect for and love of our natural world. However, I made an impulsive mistake — one that I do not take lightly — when entering a thermal area covered in snow in Yellowstone National Park to take a photograph,” Brosnan wrote in his apology. “I did not see a ‘No Trespassing’ sign posted that warned of danger nor did I hike in the immediate area. I deeply regret my transgression and offer my heartfelt apologies to all for trespassing in this sensitive area. Yellowstone and all our National Parks are to be cared for and preserved for all to enjoy.”

At the time, Brosnan was at the park for a personal trip. At that point in the season, most roads leading into Yellowstone are closed for the winter. The northeast entrance in Cooke City/Silver Gate, Montana, was among the few open roads that lead to the hot springs on the border between Montana and Wyoming.

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Authorities were alerted to the trespassing incident due to a photograph Brosnan posted to his Instagram account, which has since been removed.

Mammoth has roughly 50 hot springs, among them the Old Faithful geyser, spread out across its two boardwalks that visitors can traverse to observe the limestone springs. The scalding water can be treacherous for anyone who wanders off the boardwalks.