Marine Corps Base Hawaii in the context of "Oahu"

An islet (/ˈaɪlət/ EYE-lət) is generally a small island. Definitions vary and are not precise, but some suggest that an islet is a very small, often unnamed, island with little or no vegetation to support human habitation. It may be made of rock, sand and/or hard coral; may be permanent or tidal (i.e. surfaced reef or seamount); and may exist in the sea, lakes, rivers or any other sizeable bodies of water.

Mōkōlea Rock is an islet in Kailua Bay along the windward coast of Oʻahu in Hawaiʻi and located east of Marine Corps Base Hawaii (MCBH). Like most of the small islets off the coastline of a major island in the Hawaiian Islands, Mōkōlea is a State Bird Sanctuary containing many types of birds. Access to the islet requires a permit, and is only allowed to people involved in protecting the islet's fauna. The islet is more commonly known to local residents as "Birdshit Island", "Birdshit", or simply "Bird" because its black lava rock surface is heavily coated with bird droppings.

There is no vegetation on the islet, which is actually three connected outcroppings, the highest of which is no more than 25 feet (7.6 m) above mean sea level. All three consist of barren, jagged lava. Mokolea is part of the windward rim of the Kawainui volcanic caldera. About 300 feet (91 m) from this outcropping on the side facing Kailua Beach a shelf juts up from deep water to a depth of 25 to 30 feet (7.6 to 9.1 m). The shelf is a moderately interesting spot for scuba diving, although much of the time the area is rough, and anchoring a boat is difficult.

Kāneʻohe Bay, at 45 km (17 sq mi), is the largest sheltered body of water in the main Hawaiian Islands. This reef-dominated embayment constitutes a significant scenic and recreational feature along the northeast coast of the Island of Oʻahu. The largest population center on Kāneʻohe Bay is the town of Kāneʻohe.

The Bay is approximately 8 mi (13 km) long and 2.7 mi (4.3 km) wide, with a mouth opening of about 4.6 mi (7.4 km) wide and a maximum depth of 40 ft (12 m) in the dredged channel. It has one of the two barrier reefs in the archipelago, the other being the 27 mi (43 km) barrier reef of Molokaʻi island, and also has extensive development of shoaling coral reefs within a large lagoon. Two navigable channels cut across the northern and southern ends of the barrier reef. The deeper, northern channel, located off Kualoa Regional Park, provides entrance from the North Pacific Ocean to a ship channel dredged the length of the lagoon between 1939 and 1945. The lagoon contains extensive patch and fringing reefs and its southern end is partly enclosed by the Mokapu Peninsula. This peninsula is occupied by Marine Corps Base Hawaii.

Marine Corps Air Station Kaneohe Bay or MCAS Kaneohe Bay (IATA: NGF, ICAO: PHNG, FAA LID: NGF) is a United States Marine Corps (USMC) airfield located within the Marine Corps Base Hawaii complex, formerly known as Marine Corps Air Facility (MCAF) Kaneohe Bay or Naval Air Station (NAS) Kaneohe Bay. It is located two miles (3 km) northeast of the central business district of Kaneohe, in Honolulu County, Hawaii, United States. The airfield has one runway (4/22) with a 7,771 x 200 ft (2,369 x 61 m) asphalt surface.

The 3d Marine Littoral Regiment (3d MLR) is a regiment of the United States Marine Corps that is optimized for littoral maneuver in the Indo-Pacific Theater. Based at Marine Corps Base Hawaii, the regiment falls under the command of the 3rd Marine Division and the III Marine Expeditionary Force. It was known as the 3rd Marine Regiment from 1914 to 2022, when it was renamed as part of the Commandant of the Marine Corps' Force Design 2030 initiative. The 3d MLR has participated in the 2022 and 2023 Balikatan exercises in Northern Luzon, Philippines.