Snow Mountain is a mountain located in Franklin County, Maine, about 5 mi (8 km) from the Canada–United States border. Snow Mtn. is flanked to the northeast by Bag Pond Mountain, and to the southeast by Round Mountain.

The north side of Snow Mountain drains into Indian Stream, then into Chain of Ponds, the North Branch of the Dead River, Flagstaff Lake, the Dead River, the Kennebec River, and into the Gulf of Maine. The southeast side of Snow Mountain drains into Little Alder Stream, then into Alder Stream, and the North Branch of the Dead River. The north side of Snow Mountain drains into Big Island Pond, then into the Kennebago River, and the Androscoggin River, which drains into Merrymeeting Bay, the estuary of the Kennebec River.

Mount Diablo is a mountain of the Diablo Range, in Contra Costa County of the eastern San Francisco Bay Area in Northern California. It is south of Clayton and northeast of Danville. It is an isolated upthrust peak of 3,849 feet (1,173 meters), visible from most of the San Francisco Bay Area. Mount Diablo appears from many angles to be a double pyramid and has many subsidiary peaks. The largest and closest is North Peak, the other half of the double pyramid, which is nearly as high in elevation at 3,557 feet (1,084 m), and is about one mile (1.6 kilometers) northeast of the main summit.

The mountain is within the boundaries of Mount Diablo State Park, which is administered by California State Parks. The peak is in Mount Diablo State Park, a state park of about 20,000 acres (8,000 hectares). The state park was the first public open space established on or near the peak. According to the non-profit Save Mount Diablo, there are now varied types of protected lands on and around Mount Diablo that total more than 90,000 acres (36,000 ha). These include 38 preserves, such as nearby city open spaces, regional parks, and watersheds, which are buffered in some areas with private lands that have been protected by conservation easements.

The day use fee per vehicle for the park varies according to the entrance: $6 via Macedo Ranch (Alamo) or Mitchell Canyon (Clayton), and $10 via South Gate Rd. (Danville) & North Gate Rd. (Walnut Creek) leading up Mount Diablo.

On a clear day, the Sierra Nevada range is plainly visible from the summit. The best views are after a winter storm; a snowy Sierra shows up better, and summer days are likely to be hazy. Lassen Peak, 181 miles (291 kilometers) away, is occasionally just visible over the curve of the earth. Sentinel Dome in Yosemite National Park is visible,[8] but Half Dome is hidden by the 8000-foot ridge at 37.755N 119.6657W. Eight bridges are visible, from left to right (southwest to northeast): San Mateo, Bay, Golden Gate, San Rafael, Carquinez, Benicia, Antioch, and Rio Vista.

Claims that the mountain's viewshed is the largest in the world‍—‌or second largest after Mount Kilimanjaro‍—‌are ill-founded. It does boast one of the largest viewsheds in the Western United States and played a key role in California history.

Countless peaks in the state are taller, but Mount Diablo has a remarkable visual prominence for a mountain of such low elevation. Its looming presence over much of the Bay Area, delta, and Central Valley, and good visibility even from the Mother Lode, all key regions during the gold rush and early statehood, made it an important landmark for mapping and navigation. The summit is used as the reference datum for land surveying in much of northern California and Nevada.