Things move at a slow pace in Chile's northernmost city, just 20km from the Peruvian border.

Ten miles north of Arica is the Peruvian border, which is marked only by a white pole every 1,000 yards.

A flat sea of farmland near the Peruvian border is brightened with a splash of colour.

Back to the Peruvian border.

Camouflage-print jackets were trimmed with Peruvian floral borders.

One other team of astronomers, in northern Chile near the Peruvian border, also made a successful observation.

Peru was needed as a base of operations and a defensive backstop against guerrillas based in Colombia's south, not far from the Peruvian border.

From 1814 to 1818, Güemes and his gauchos, on the Peruvian border left by the regular troops, resisted the royalist armies.

Following due west of here, the land elevates as it approaches the Peruvian border.

Day 23 - Take a bus or collectivo from the beach town to the Peruvian border and cross.