Nicaragua, officially the Republic of Nicaragua, is the geographically largest country in Central America, comprising 130,370 km2 (50,340 sq mi). With a population of 6,850,540 as of 2021, it is the third-most populous country in Central America after Guatemala and Honduras. Nicaragua is bordered by Honduras to the north, the Caribbean Sea to the east, Costa Rica to the south, and the Pacific Ocean and a shared maritime border with El Salvador to the west. The country's largest city and national capital is Managua, the fourth-largest city in Central America with a population of 1,055,247 as of 2020. Nicaragua's multiethnic population includes people of mestizo, indigenous, European, and African heritage. The country's most spoken language is Spanish, though indigenous tribes on the Mosquito Coast speak their own languages and English.

Central America is a subregion of North America. Its political boundaries are defined as bordering Mexico to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. Central America is usually defined as consisting of seven countries: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama. Within Central America is the Mesoamerican biodiversity hotspot, which extends from northern Guatemala to central Panama. Due to the presence of several active geologic faults and the Central America Volcanic Arc, there is a high amount of seismic activity in the region, such as volcanic eruptions and earthquakes, which has resulted in death, injury, and property damage.