Historical Earthquake Records and Seismic Data for Gearhart Mountain Wilderness in Oregon

Modoc National Forest: Protected Landscape and Warner Mountains Geography

High desert volcanic terrain in northeastern California

Modoc National Forest encompasses a massive expanse of volcanic plateaus and rugged mountain ridges in the northeastern corner of California. This protected area offers significant geographic variety, transitioning from arid sagebrush basins to lush, high-elevation conifer forests. It serves as a vital natural landscape, home to the South Warner Wilderness and large stands of old-growth timber, reflecting the unique geologic history of the regional lava flows.

Area

6,695.09 km²

Established

1904

Relief

Mountain

Access

Moderate access

Crater Lake National Park: Oregon National Park Atlas of Volcanic Landscapes

Explore mapped boundaries and unique caldera geography.

Crater Lake National Park represents a significant protected area within Oregon, defined by the dramatic volcanic caldera it contains. This national park is celebrated for its exceptionally deep, clear blue lake, formed by the collapse of Mount Mazama, offering a unique subject for geographic and landscape study. Users can explore its mapped boundaries and understand its position within the broader atlas of protected lands and mountainous terrain of the Cascade Range.

Area

741.48 km²

Established

1902

IUCN

II

Visitors

527K annual

Mountain Lakes Wilderness: Geographic Atlas of Oregon's Glacial Volcanic Reserve

Mapping the volcanic cirques and square boundaries of the southern Cascades.

Mountain Lakes Wilderness serves as a primary geographic anchor in the southern Cascades, where shield volcanoes meet glacially carved basins. This protected area contains over twenty lakes situated in high-altitude cirques near the summits of volcanic peaks like Aspen Butte. The area is defined by its distinctive square survey-township boundary, providing a clear footprint of wilderness conservation within the larger Fremont-Winema National Forest terrain.

Area

93 km²

Established

1964

IUCN

Ib

Relief

Mountain

Rogue River, Siskiyou National Forest: Mapped Geography and Protected Area Overview

Tracing volcanic peaks and river-carved mountain terrain in Oregon

Spanning nearly 7,300 square kilometers, the Rogue River, Siskiyou National Forest acts as a crucial ecological anchor in the Pacific Northwest. This overview details its unique mountain geography, the extensive wilderness tracts within its boundaries, and the river systems that define its mountainous character.

Area

6,973.46 km²

Established

2004

Visitors

915K annual

Relief

Mountain

Butte Valley National Grassland: Geographic Overview and Protected Landscape Mapping

High-desert sagebrush steppe in Northern California

Butte Valley National Grassland is a singular protected landscape in northern California, known for its expansive sagebrush steppe and dry lakebed terrain. Centered in the Klamath River basin, the grassland provides an essential high-desert habitat framed by the dramatic volcanic presence of the Cascade Range and Mount Shasta. This atlas entry details the geography, soil composition, and mountain-framed boundaries of this unique protected area.

Area

74.56 km²

Established

1991

Relief

Upland

Climate

Temperate

Mount Thielsen Wilderness: Protected Volcanic Terrain and Glacial Landscapes in Oregon

Southern Cascade Range mountain and forest geography

Mount Thielsen Wilderness offers a compact yet dramatic study of southern Cascade topography. Dominated by its signature lightning-struck volcanic peak, the area encompasses a complex network of glacial cirques, deep valleys, and high-altitude forest zones. This map-rich entry point provides a closer look at the protected boundaries and natural geological features that define this significant segment of Oregon wilderness.

Area

223 km²

Established

1984

IUCN

Ib

Relief

Mountain

Shasta, Trinity National Forest: Mapping the Protected Landscapes of Northern California

Volcanic peaks, expansive reservoirs, and rugged mountain wilderness

Spanning over two million acres, Shasta, Trinity National Forest represents a major protected landscape in Northern California. The geography includes the iconic Mount Shasta volcano and the complex shoreline of Shasta Lake, while hosting expansive wilderness areas and diverse terrain ranging from oak-forested foothills to alpine meadows.

Area

8,942.87 km²

Established

1954

Relief

Mountain

Climate

Temperate

Rogue-Umpqua Divide Wilderness: Protected Ridge Landscape and Watershed Geography

High-country wilderness area in southwestern Oregon

Rogue-Umpqua Divide Wilderness preserves a dense, high-elevation ridge environment that separates the Rogue and Umpqua river drainages. Featuring a complex mix of volcanic and sedimentary rock outcrops within a continuous conifer canopy, the area offers a unique look at forest ecology in the Klamath Mountains. The geography provides extensive views across both watersheds and stands as a primary example of protected montane forest terrain within the Oregon landscape.

Area

134 km²

Established

1984

IUCN

Ib

Water

Minor water