The Marlborough Sounds are an extensive network of sea-drowned valleys at the northern end of the South Island of New Zealand. The Marlborough Sounds were created by a combination of land subsidence and rising sea levels.

Matagalpa is a city in Nicaragua which is the capital of the department of Matagalpa. The city has a population of 108,052, while the population of the department is 586,986. Matagalpa is Nicaragua's 8th largest city.

County Mayo is on the west coast of Ireland. Its scenery ranges from verdant to desertlike, with rocky cliffs at the Atlantic coast. Clew Bay is dotted with small, steep-sided islands, including Clare Island.

Masuria is a region in northeastern Poland, famous for its 2,000 lakes. Masuria occupies much of the Masurian Lake District. Administratively, it is part of the Warmian-Masurian Voivodeship. Its biggest city, often regarded as its capital, is Ełk.

The Mekong, or Mekong River, is a trans-boundary river in East Asia and Southeast Asia.

Michoacán, formally Michoacán de Ocampo, officially Estado Libre y Soberano de Michoacán de Ocampo, is one of the 32 states which comprise the Federal Entities of Mexico. The state is divided into 113 municipalities and its capital city is Morelia.

Miri is a Malaysian city on the northwest coast of the island of Borneo. At the Petroleum Museum, on Canada Hill, hands-on exhibits explore the region’s oil history. Outside is the Grand Old Lady, a 1910 oil well and local landmark.

Moldova and Romania have experienced an exceptional relationship since Moldova's independence in 1991

Monteverde, Costa Rica is a small community in Puntarenas, Costa Rica, located in the Cordillera de Tilarán mountain range. Roughly a four-hour drive from the Central Valley, Monteverde is one of the country's major ecotourism destinations.

Montjuïc is a hill in Barcelona, Catalonia, Spain.