Marajó in the context of "Macapá"

A river island is any exposed landmass surrounded by river water. Properly defined, it excludes shoals between seasonally varying flows and may exclude semi-coastal islands in river deltas such as Marajó.

These islands result from changes in the course of a river. Such changes may be caused by interactions with a tributary, or by the opposing fluvial actions of deposition and/or erosion that form a natural cut and meander. Nascent vegetation-free shoals and mudflats may dissipate and shift or build up into such islands through deposition; the process may be assisted through artificial reinforcement or natural factors, such as reeds, palms, evergreen trees or willows, that act as obstacles or erosion barriers, so that water flows around them. Islands may be small or large, covering many square kilometers, examples of which are given below.

The Amazon Delta (Portuguese: delta do Amazonas) is a vast river delta formed by the Amazon River and the Tocantins River (through the Pará River distributary channel) in northern South America. It is located in the Brazilian states of Amapá and Pará and encompasses the Marajó Archipelago, with Marajó Island as its largest island. The main cities located in the vicinity are Belém and Macapá, each with its respective metropolitan area.

The Amazon Delta has a tropical climate with high humidity and high temperatures. It has a wet season with frequent flooding and a dry season where the delta dries out. These seasons shape the environment of the Amazon Delta and the life in it, such as the water buffalo for which Marajó Island is well known, three-toed sloth, capybara, giant anteater, giant otter, jaguar and pink river dolphins.

Pará (Brazilian Portuguese: [paˈɾa] ) is a state of Brazil, located in northern Brazil and traversed by the lower Amazon River. It borders the Brazilian states of Amapá, Maranhão, Tocantins, Mato Grosso, Amazonas and Roraima. To the northwest are the borders of Guyana and Suriname, to the northeast of Pará is the Atlantic Ocean. The capital and largest city is Belém, which is located at the Marajó bay, near the estuary of the Amazon river. The state, which is home to 4.1% of the Brazilian population, is responsible for just 2.2% of the Brazilian GDP.

Pará is the most populous state of the North Region, with a population of over 8.6 million, being the ninth-most populous state in Brazil. It is the second-largest state of Brazil in area, at 1.2 million square kilometres (460,000 sq mi), second only to Amazonas upriver. Its most famous icons are the Amazon River and the Amazon rainforest. Pará produces rubber (extracted from rubber tree groves), cassava, açaí, pineapple, cocoa, black pepper, coconut, banana, tropical hardwoods such as mahogany, and minerals such as iron ore and bauxite. A new commodity crop is soy, cultivated in the region of Santarém.

The Marajó Archipelago (Portuguese: arquipélago do Marajó) is the largest fluvial-maritime archipelago on Earth. Located in the Brazilian states of Amapá and Pará, the island group has approx. 2,500 islands.

The main island of the archipelago also has the name of Marajó, having about 42,000 km² of area, considered, due to its size, as the largest coastal island in Brazil, extending from the mouth of the Amazon River, between the Line of the Equator and the parallel 1.55º south latitude and, in the E/W direction between the meridians 47º and 53º west longitude, until the Atlantic Ocean.

Belém (Portuguese: [beˈlẽj]; Portuguese for Bethlehem; initially called Nossa Senhora de Belém do Grão-Pará, in English Our Lady of Bethlehem of Great Pará), often called Belém of Pará, is the capital and largest city of the state of Pará in the north of Brazil. It is the gateway to the Amazon River with a busy port, airport, and bus/coach station. Belém lies approximately 100 km (62.1 miles) upriver from the Atlantic Ocean, on the Pará River, which is part of the greater Amazon River system, separated from the larger part of the Amazon delta by Ilha de Marajó (Marajo Island). With an estimated population of 1,398,531 people — or 2,491,052, considering its metropolitan area — it is the 12th most populous city in Brazil, as well as the 16th by economic relevance. It is the second largest in the North Region, second only to Manaus, in the state of Amazonas.

Founded in 1616 by the Kingdom of Portugal, Belém was the first European colony on the Amazon but did not become part of Brazil until 1775. The newer part of the city has modern buildings and skyscrapers. The colonial portion retains the charm of tree-filled squares, churches and traditional blue tiles. The city has a rich history and architecture from colonial times. Recently, it witnessed a skyscraper boom.

The Marajoara or Marajó culture was an ancient pre-Cabraline era culture that flourished on Marajó island at the mouth of the Amazon River in northern Brazil. In a survey, Charles C. Mann suggests the culture appeared to flourish between 800 AD and 1400 AD, based on archeological studies. Researchers have documented that there was human activity at these sites as early as 1000 BC. The culture seems to have persisted into the colonial era.

The Pororoca (Portuguese pronunciation: [pɔɾɔˈɾɔkɐ], [poɾoˈɾɔkɐ]) is a tidal bore, with waves up to 4 m (13 ft) high that travel as much as 800 km (500 mi) inland upstream on the Amazon River and adjacent rivers. It occurs at the mouth of the river where its waters meet the Atlantic Ocean. It can be observed from the islands Marajó and Caviana, and in various rivers of the state Pará.