Small island country in the middle of the Mediterranean between Sicily and Libya. Has passed between many rulers in its days but is perhaps best known as the home of the Knights Hospitalier (or the Knights of St. John) in the Middle Ages and the home of the British military in the Second World War (often referred to as a stationary aircraft carrier.)

Maltus was home to the ancient race known as the Maltusians. This race eventually evolved into the Guardians of the Universe, the Controllers, and the Zamarons over 10 billion years ago.

It is an American national park in west-central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world.

The fictitious city of Plastic Man.

The place where Joshua Clark met John Carter.

Brazilian city.

Manchester, Alabama was the home of Max Mercury, where he raised the young speedster Impulse.

Major city in England

Region of China, sometimes includes part of Russia.

The home of the Mandolorians. A race of farmers and warriors and both. It holds a vast amount of beskar aka Mandalorian Iron.

The oldest and most densely populated borough of New York City.

Manhattan Harbor is a harbor in New York. Specifically the Manhattan borough of NYC.

A museum dedicated to preserving the legacy of superhumans

Medical Complex located in South side of Manhattan, in New York City.

The capital of the Phillipines

Capitol city of House Citrine in Gemworld.

A province in Canada

The Mansions of Silence are rejected creations, and all the universes that can possibly exist. It also is where beings go to when they die.

Italian city.

Marathon City is a village in Marathon County, Wisconsin.

Marblehead is a coastal New England town in Essex County, Massachusetts.

It is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of Philippines and South of Japan. Is about 2,550 kilometres (1,580 mi) long, and reaches a maximum-known depth of 10.994 km. Some unrepeated measurements place the deepest portion at 11.03 kilometres (6.85 mi).

Marine Base Alpha can be found in the caverns beneath Ocean Point Aquarium and Ocean Point Institute for Marine Research. It has not been explained what happens here, but it is known David Ocean works here.

A fictional Asian country in the Marvel Universe.

Markovia is the home country of Brion Markov aka Geo-Force and Terra. It is supposedly located in Europe between Switzerland and Italy. Traditionally a country of farmers and miners, it has some tech industries. The capital city Markovburg is the royal seat of the House of Markov.

City in Morocco

The fourth planet from the Sun and Earth's neighbor. It has two moons, Phobos and Deimos.

Second largest city of France.

A nation in Oceania; formerly owned by the United States as part of the Trust Territory of the Pacific Islands. The islands (particularly Bikini Atoll) are most famous for being used by the US government for nuclear weapons tests in the mid-20th century.

The Bronze Age home of the Martian race, orbiting a star in the constellation Cygnus. They migrated there after Commander Blanx decimated their original planet, Mars.

A Caribbean island territory owned by France.

This is the collection of realities known in the Marvel universe, known as the Multiverse.