Matgue River

Piti Bomb Holes Marine Preserve is a marine protected area comprising all of Piti Bay on the western coast of Guam, located off of the village of Piti in the Philippine Sea. The defining "bomb hole" features, named because they look like bomb craters in the reef flat, are actually natural percolation pits where fresh water filters into the shallow lagoon at a depth of 25 to 30 feet (7.6 to 9.1 m). The largest pit houses the commercial Fish Eye Marine Park tourist attraction, which includes a wooden pier to a underwater observatory and a Seawalker tour of the lagoon bottom. It is visited by more than 200,000 people annually. The Piti preserve is the most ecologically diverse of Guam's five marine preserves. The pit around Fish Eye is a popular snorkeling and recreational diving site.

The Matgue River Valley Battle Area was the site of a decisive Allied victory during the 1944 Battle of Guam. The area was the scene of a major counterattack by Japanese forces against the Allied beachhead, in which the Japanese suffered extremely heavy casualties and were beaten back. After this attack, the remaining Japanese forces on the island retreated to the north. The area is located in the hills southwest of Asan Point along the Matgue River. The only surviving structural remnants associated with the battle are caves dug by the Japanese as defensive positions prior to the invasion. The site was listed on the National Register of Historic Places in 1975.

The Asan Invasion Beach is a historic site in the village of Asan, Guam. The beaches of Asan were one of the landing sites of American forces in the 1944 Battle of Guam, in which the island was retaken from occupying Japanese forces. The designated historic site includes the beaches extending between Asan Point and Adelup Point, and extends inland roughly to Guam Highway 1. It also includes the water area extending from the beach to the reef, about 100 metres (330 ft) out, an area that includes at least one abandoned Allied landing vehicle. The beaches, fortifications, and water out to the reef were listed on the National Register of Historic Places in 1979. Portions of them are part of the Asan Beach Unit of the War in the Pacific National Historical Park, which includes a public access point at Asan Point. Just east of this is Memorial Beach Park, a municipal beachfront park that was listed on the National Register in 1974.

The Asan River is a river in the United States territory of Guam that lies entirely within the village of Asan-Maina. It originates in the highlands of Nimitz Hill Annex and flows through the Asan Inland Unit of War in the Pacific National Historical Park (WAPA) and enters the community of Asan. It then briefly re-enters WAPA at its Asan Inland Unit, with the mouth at the eastern end of Asan Memorial Park into Asan Bay. The river was thus a significant geographical feature of the Asan Invasion Beach for U.S. forces during the initial landings on Guam in July 1944.

Asan-Maina (Chamorro: Assan-Ma'ina) is a village located on the western shore of the United States territory of Guam. The municipality combines the names of the coastal community of Asan with Maina, a community along the slopes of the Fonte River valley to the east. Asan was the northern landing site for United States Marines during Guam's liberation from the Japanese during World War II. Asan Beach Park is part of the War in the Pacific National Historic Park. The third community comprising Asan-Maina is Nimitz Hill Annex in the hills above Asan and Maina, which is the location of the Joint Region Marianas headquarters. Asan-Maina is located in the Luchan (Western) District.

The Asan Ridge Battle Area was the scene of some of the heaviest fighting in the 1944 Battle of Guam, the World War II battle in which Allied forces recaptured Guam from occupying Japanese forces. The area is now part of the Asan Inland Unit of the War in the Pacific National Historical Park, and was listed on the National Register of Historic Places in 1975. The area is just inland of the Asan Invasion Beach, one of the two major beachheads established by the Allies, and has a commanding view over that area. The landforms included in this area are Chorrito Cliff, Bundschuh Ridge, and Nimitz Hill, and they were heavily fortified by the Japanese prior to the battle. Surviving elements of these fortifications include two concrete pillboxes (one unfinished), and an unfinished battery of 4-inch guns.

Nimitz Hill is a community and census-designated place (CDP) in Piti, Guam. is located immediately west of the Nimitz Hill Annex CDP in Asan-Maina, which contains the geographic feature of Nimitz Hill. In normal conversation, the Nimitz Hill CDP and Nimitz Hill Annex CDP are often collectively referred to as "Nimitz Hill." Nimitz Hill is accessed and bounded to the south by Guam Highway 6, known as Spruance Drive in Piti. Taguag Cemetery, also known as Vicente A. Limtiaco Memorial Cemetery, lies to the southwest. Nimitz Hill CDP and the Asan Inland Unit of War in the Pacific National Historical Park form the western boundary. To the north is the uninhabited cliff area overlooking Piti Bay and Apra Harbor, with the Piti CDP below.

The Taguag River is a river in the United States territory of Guam.

Asan is a community and census-designated place (CDP) along the western coast of the U.S. territory of Guam. Asan, along with Maina and Nimitz Hill Annex, are the three communities in the village of Asan-Maina. It is known for being the location of the northern invasion beach used by the United States during the retaking of Guam in 1944.

The Quan Outdoor Oven is a 20th-century version of a traditional hotnu, or outside oven, on the island of Guam. This oven is located on Quan family land on J. C. Santos Road, south of Santos Memorial Park in Piti. Although built out of modern materials, it follows a traditional form that has been in use on Guam since these ovens were introduced by the Spanish in the 17th century. It is a barrel-shaped structure about 2 metres (6.6 ft) long, 1.68 metres (5.5 ft) wide, and 1.37 metres (4.5 ft) wide, rising to a height of 0.64 metres (2.1 ft). The base of the structure is either poured concrete or concrete blocks. The interior of the vault is made out of heat-resistant bricks, while the exterior is finished in concrete. When recorded in 2010, its main opening was damaged. The oven was listed on the National Register of Historic Places in 2010.

The Piti Guns or Piti Coastal Defense Guns is the site of three Vickers-type Model 3 140-millimetre (5.5 in) coastal defense guns in the War in the Pacific National Historical Park in Piti, Guam. The Japanese manufactured these Model 3 coastal defense guns in 1914. During the Japanese Occupation of Guam from 1941 to 1944, they built up defensive positions on the island. The Chamorro population was forced to work in building up these defenses, and did so here at the Piti Guns. The Piti guns were strategically placed in a village consisting mostly of rice paddies in 1944. This area was chosen to defend the beach at Asan from a possible invasion. These guns have a firing range of close to 10 miles (16 km) and were intended for use against ships and landing craft. When the United States Armed Forces came to retake the island on July 21, 1944, these guns were not fully operational. Consequently, not one of the three coastal defense guns was ever fired. However, these guns are representative of the type of weapons used by the Japanese on Guam for fortification efforts.

The Capture of Guam was a bloodless engagement between the United States and Spain during the Spanish–American War. The U.S. Navy sent a single cruiser, USS Charleston, to capture the island of Guam, which was under Spanish control. The Spanish garrison on the island had no knowledge of the war and no real ability to resist the American forces. They surrendered without resistance, and the island passed into American control. The event was the only conflict of the Spanish–American War on Guam.