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On the road - Migrants, part of a caravan of thousands traveling from Central America en route to the United States, walk by the road that links Ciudad Hidalgo with Tapachula, Mexico.

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Hitching a ride - A truck helps ease the burden on their feet as a number of migrants hitchhike a ride to Cordoba from Isla, Mexico.

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Looking for a better life - Jonathan Rodriguez, a seven-year-old migrant boy, waits to hitchhike after resting in a makeshift camp in Matías Romero Avendaño, Mexico.

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Hoping for sweeter dreams - Nancy Alejandra, an 11-year-old migrant girl from Honduras, sleeps on the roadside as she waits to board a bus to Mexico.

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A wall of despair - Looking out to the city through a wall from inside a makeshift camp in Mexico City, Mexico.

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A welcome handout - Migrants wait to receive fruits while they stay in a temporary shelter in Matías Romero Avendaño, Mexico.

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Dealing with the authorities - Migrants walk past Mexican police officers after crossing the Suchiate River, a natural border between Guatemala and Mexico.

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The caravan heads North - A sea of humanity walks the road near Sayula de Aleman, Mexico.

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Washing on the wire - Jennifer Gato Molina Alejandra, a five-year-old migrant girl from Honduras, climbs a fence to reach dried washing in Querétaro, Mexico.

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Waiting to ride into a better future - Cristian Israel waits to hitchhike after resting in a makeshift camp in Matías Romero Avendaño, Mexico.

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By any means necessary - Migrants travel by any means necessary as they make their way to Irapuato from Querétaro, Mexico.

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Fowl conditions - The interior of a chicken truck ends up a cramped and dangerous mode of transport.

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Light at the end of his rainbow? - A youth is pictured as he waits to open the gate on the bridge that connects Mexico and Guatemala in Ciudad Hidalgo, Mexico.

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Space is a premium - A provisional shelter in Irapuato, Mexico, is overwhelmed by the sheer numbers seeking overnight refuge.

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The issue of mobility - The vast caravan includes the infirm and disabled, such is the desire to leave behind the poverty and violence blighting the lands of their birth.

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A new day - Dawn sees the migrants making their way from Huixtla to Mapastepec, Mexico.

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Dawn silhouettes - At this time of year, daybreak temperatures are chilly.

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Water hazard - Central American migrants cross the Suchiate River into Mexico on a makeshift raft. Theirs is a slow and often hazardous journey.

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Holding on to hope - One individual holds on to the side-view mirror of a passing truck as he and others scramble to hitch a ride to Arriaga, Mexico.

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Welcoming committee - Police officers line up as a temporary blockade against the caravan as it makes its way to San Pedro Tapanatepec from Arriaga, Mexico.

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Sleeping rough - Resting along sidewalks of Huixtla, Mexico, after dark.

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A tender embrace - Israel and Estelle, both from Honduras, kiss while bathing in Río Novillero in San Pedro Tapanatepec, Mexico.

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Borderline moment - Migrants contemplate the fortified border gate between Guatemala and Mexico, in Tecun Uman, Guatemala.

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Childlike innocence - Six-year-old Osman Joel Hernandez plays with hula hoops as he rests in a makeshift camp in Juchitán, Mexico.

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Grief and despair - Relatives react with dismay at the coffin of Henry Adalid Diaz, a Honduran migrant who died during a clash with Mexican police at the Mexico-Guatemala border.

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Overground and underground - Migrants use the subway as they make their way to Querétaro from Mexico City.

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Sole destroying - Tired, blistered feet—the physical legacy of walking for long hours every day for weeks.

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Human rights message - A youth wears a human rights for migrants card around his neck as he rests in a makeshift camp in Matias Romero, Mexico.

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Keeping up appearances - Transgender migrant Nati Vanegas, aged 18 from Honduras, has makeup applied during a stop in Juchitán, Mexico.

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Turning the tide - Daniel holds one-year-old Daniela, both from El Salvador, through the Suchiate River into Mexico from Guatemala in Ciudad Hidalgo, Mexico.

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Stars and stripes -

A Honduran migrant pauses in Tecun Uman, Guatemala. His T-shirt illustrates the land of his dreams.

See also: Which states have the highest concentration of immigrants?

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