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The lingering race for the Democratic presidential nomination is moving to an unlikely battleground this week: the tiny island territory of Guam.

Both Hillary Clinton and Bernie Sanders are running radio advertisements on the Western Pacific island, costing each candidate more than $10,000, before Democrats cast their ballots in the island’s caucuses this Saturday.

Clinton went up on the airwaves first, according to data provided by the media-monitoring company The Tracking Firm. She reserved about $22,000 on a number of stations on the island, beginning Tuesday and running through Saturday.

Sanders responded on Thursday, making a $12,000 outlay through Saturday on many of the same stations.

Persuasion efforts on the island haven’t been limited to radio advertising: Chelsea Clinton penned an op-ed supporting her mother’s campaign for the Pacific Daily News published on Wednesday. “My mom is running to break down all the barriers that still stand in our way, and Guam has more than its fair share of barriers,” she wrote for the paper. “I hope that the people of Guam know that a President Hillary Clinton would pay attention to Guam and Guam’s issues and fight every day to provide the same ladders to opportunity as on the mainland.”

Guam will send 12 delegates to the Democratic convention this summer — seven pledged delegates and five superdelegates.

The candidates themselves won’t be traveling to Guam — they are focused on the primary in West Virginia next Tuesday, and the May 17 primaries in Kentucky and Oregon.

Voting in Guam will be conducted Saturday from 10 a.m. through 8 p.m. local time at a shopping mall in the capital of Hagåtña. The caucus is closed to non-Democrats, but already-enrolled voters can register with the party at the caucus site.