As of February 2026, the newest national monuments in the United States are the Chuckwalla National Monument and the Sáttítla National Monument, both designated by President Biden in late 2025. Chuckwalla encompasses over 600,000 acres in the California desert, protecting critical habitat for the desert tortoise and sacred lands for local Tribes. Sáttítla covers approximately 200,000 acres in Northern California, specifically the Medicine Lake Highlands, which are of immense spiritual significance to the Pit River Tribe. These 2026 designations were part of a major federal push to conserve 30% of US lands and waters by 2030. If you are a 2026 "park-bagger," these areas offer incredible, rugged landscapes far away from the heavy crowds of nearby Joshua Tree or Yosemite, though they often lack developed visitor centers in their first few years of existence.